This topic describes the release notes for the minor versions of the kernel, console, Ganos, and API of PolarDB for PostgreSQL and provides links to the relevant references.

Note You can execute the following statement to view the minor version of the kernel that is used by PolarDB for PostgreSQL:
show polar_version;

The following table describes the version mappings between PolarDB for PostgreSQL and open source PostgreSQL.

PolarDB for PostgreSQL version Open source PostgreSQL version
v1.1.16 11.9
v1.1.15 11.9
v1.1.14 11.9
v1.1.13 11.9
V1.1.12 11.9
V1.1.11 11.9
V1.1.10 11.9
V1.1.9 11.9
V1.1.8 11.9
V1.1.7 11.9
V1.1.6 11.9
V1.1.5 11.8.15
V1.1.4 11.5.12
V1.1.3 11.5.12
V1.1.2 11.2
V1.1.1 11.2c
V1.1.0 11.2

September 2021

Minor version of the kernel (V1.1.16)

Category Feature Description References
Added features Support for the AssertOp operator in cross-node parallel execution The AssertOp operator is supported by the cross-node parallel execution feature to check runtime constraints on the executor. Cross-node parallel execution
Dynamic partition pruning in cross-node parallel execution Dynamic partition pruning is supported by the cross-node parallel execution feature to improve the performance of hash joins for partitioned tables.
Optimized features Support for constant expressions in cross-node parallel execution Constant expressions are supported by the cross-node parallel execution feature. None
Operator-level memory limits Operator-level memory limits can be used to reduce out of memory (OOM) risks and improve PolarDB stability. None

Ganos (V4.0)

Category Feature Description References
Optimized features Functions that are used to compute raster surfaces The functions that are used to compute raster surfaces are optimized. The optimized functions return raster objects instead of pixel matrices. ST_Aspect, ST_Slope, and ST_Hillshade
ST_Split function The ST_Split function is optimized. The optimized function splits a trajectory object based on a specified rule and returns an array of sub-trajectories. ST_Split
Fixed issues The following issue is fixed: The ST_SrEqual function fails to determine whether two spatial reference systems are the same in specific scenarios.

July 2021

Minor version of the kernel (V1.1.14)

Category Feature Description References
Added features Compatibility with GNU Compiler Collection (GCC) 9 The ApsaraDB PolarDB PostgreSQL-compatible edition is compatible with GCC 9.2.1. This can optimize compilation and improve performance. None

Ganos (V3.9)

Category Feature Description References
Added features ST_RemoveDriftPoints function The ST_RemoveDriftPoints function is supported. This function is used to delete drift points from a trajectory based on specified rules. ST_removeDriftPoints
ST_Split function The ST_Split function is supported. This function is used to split a trajectory based on a specified geometry object. ST_Split
ST_ExportTo function The ST_ExportTo function is supported. This function is used to export a trajectory from a database to an external file for storage. Only metadata is retained in the database. ST_ExportTo
ST_IsExternal function The ST_IsExternal function is supported. This function is used to check whether a trajectory is stored in an external file. ST_IsExternal
ST_ImportFrom function The ST_ImportFrom function is supported. This function is used to import a trajectory from an external file back to a database. ST_importFrom
ST_StorageLocation function The ST_StorageLocation function is supported. This function is used to return the external location of a trajectory. ST_StorageLocation
ST_AKID function The ST_AKID function is supported. This function is used to return an AccessKey ID that is used to read a trajectory from Object Storage Service (OSS). ST_AKID
ST_SetAccessKey function The ST_SetAccessKey function is supported. This function is used to configure an AccessKey pair that is used to read a trajectory from OSS. An AccessKey pair consists of an AccessKey ID and an AccessKey secret. An AccessKey ID is similar to a logon username, and an AccessKey secret is similar to a password. ST_SetAccessKey
ST_SetAKID function The ST_SetAKID function is supported. This function is used to configure an AccessKey ID that is used to read a trajectory from OSS. ST_SetAkId
ST_SetAKSecret function The ST_SetAKSecret function is supported. This function is used to configure an AccessKey secret that is used to read a trajectory from OSS. ST_SetAkSecret
ST_SetStorageLocation function The ST_SetStorageLocation function is supported. This function is used to configure the external location from which a trajectory can be read. ST_SetStorageLocation
ST_DeleteGtf function The ST_DeleteGtf function is supported. This function is used to delete all exported trajectory files in a specified folder. ST_DeleteGTF
Fixed issues The following issue is fixed: Data cannot be filtered by strings when you create a vector pyramid.
The following issue is fixed: The layer list cannot be displayed when QGIS is connected.

June 2021

Minor version of the kernel (V1.1.13)

Category Feature Description References
Added features Display of I/O statistics in the polar_stat_sql and polar_stat_plan views
  • The relevant resource information can be obtained by querying different views. This can help identify performance issues.
  • Performance diagnostics is supported by PolarDB for PostgreSQL. This allows you to analyze performance issues related to instances and SQL queries.
  • Relevant parameters are supported to display I/O statistics in the polar_stat_sql and polar_stat_plan views.
Performance views and Performance diagnostics
Cross-node parallel execution The polar_bt_write_page_buffer_size parameter is supported. This parameter specifies the write I/O policy that is used while an index is being created. Overview of cross-node parallel execution
Cross-node parallel execution can be used to scan Block Range Indexes (BRIN indexes). This further improves query performance. Use cross-node parallel execution to accelerate index creation
Optimized features polar_crash_recovery_rto parameter The polar_crash_recovery_rto parameter is supported. This parameter specifies an expected Recovery Time Objective (RTO) for an instance. This ensures that databases on an instance can restart for recovery and become available within the expected RTO if the instance fails. None

Ganos (V3.8)

Category Feature Description References
Added features ST_AsDatasetFile function The ST_AsDatasetFile function is supported. This function is used to return a specified range of raster objects as a binary stream in the specified file format. ST_AsDatasetFile
ST_RasterDrivers function The ST_RasterDrivers function is supported. This function is used to query the status of all raster data drivers. ST_RasterDrivers
Fixed issues The following issue is fixed: A reprojection fails when you use the ST_Clip function to specify a spatial reference system for the reprojection.

May 2021

Minor version of the kernel (V1.1.12)

Category Feature Description References
Added features Parallel execution Cross-node parallel execution is supported.
  • SQL queries can be run across multiple read-only nodes in a distributed manner. This improves the query performance of PolarDB for PostgreSQL.
  • Cross-node parallel execution can be used to accelerate the process of creating indexes in scenarios where large tables are used.
Cross-node parallel execution
Optimized features Performance monitoring The max_slot_wal_keep_size parameter is supported. This parameter is used to limit the size of files that use replication slots. This can prevent Write-Ahead Logging (WAL) files from accumulating. None
polar_resource_group plug-in Multiple parameters including total_mem_limit_remain_size, idle_mem_limit_rate, enable_terminate_active, policy_mem_release, and enable_log can be used to configure the polar_resource_group plug-in. This avoids excessive usage of memory and ensures the normal running of database processes. None
Improved startup speed of read-only nodes The startup of read-only nodes is sped up. This improves performance. None
Failover The parallel playback feature can be used to accelerate the recovery of database services after a failover. In most cases, the database services can be recovered within 15 seconds after a primary database fails. None

Ganos (V3.7)

Category Feature Description References
Added features Spatio-temporal parallel query Spatial indexes can be queried in parallel. This improves query efficiency. Enable spatio-temporal parallel query
Optimized features Raster image processing The ST_SubRaster function can be used to convert the pixel types of raster objects and stretch the pixel values. Raster image processing can be used in AI recognition scenarios in which multi-band remote sensing images are converted to three-band images. ST_SubRaster
Fixed issues The following issue is fixed: A database may unexpectedly exit when you perform a raster data analysis on invalid histogram information.
The following issue is fixed: After a specified raster dataset is transformed into another projection, a failure may occur when you disconnect from your database.
The following issue is fixed: A database may unexpectedly exit when you import raster data to the database.

April 2021

Minor version of the kernel (V1.1.11)

Category Feature Description References
Added features idle_session_timeout parameter

The idle_session_timeout parameter is supported. This parameter specifies the period during which sessions can remain idle before the sessions time out. Sessions are terminated after they time out.

  • Valid values: 0 to 2147483647

    The default value of 0 specifies that the timeout feature is disabled for idle sessions.

  • Unit
    • 'ms': millisecond. This is the default unit.
    • 's': second.
    • 'min': minute.
    • 'h': hour.
    • 'd': day.
None
Fixed issues The following issue is fixed: The built-in DBMS_JOB package cannot be used across databases.
The following issue is fixed: The CONNECT BY clause and the ROWNUM function cannot be used together.
The following issue is fixed: The CONNECT BY clause cannot find parent objects.

Ganos (V3.6)

Category Feature Description References
Added features Raster data type The ST_RPCGeoreference function is supported. This function is used to retrieve the information about rational polynomial coefficients (RPCs) of a raster object. ST_RPCGeoreference
The ST_SetRPCGeoreference function is supported. This function is used to specify RPC parameters for a raster object. ST_SetRPCGeoreference
The ST_RPCRectify function is supported. This function is used to rectify a raster object based on the RPC parameters and return the rectified raster object. ST_RPCRectify
GiST indexing GiST indexes can be created in parallel. Create spatial indexes in parallel
Fixed issues The following issue is fixed: When you use the pg_dump utility, custom spatial references cannot be exported.

March 2021

Minor version of the kernel (V1.1.10)

Category Feature Description References
Optimized features Performance optimization The I/O performance of reading data files can be improved by caching information about table sizes into shared memory. None

Ganos (V3.5)

Category Feature Description References
Added features Storage optimization for large spatio-temporal objects The Simple storage policy is supported. This policy optimizes storage for large spatio-temporal objects. Use the Simple storage policy
Optimized features Raster object The chunked data in a raster object can be automatically deleted when the raster object is updated by using a new raster object. None
Fixed issues The following issue is fixed: The Ganos Trajectory extension fails to be upgraded.
The following issue is fixed: In some cases, an error occurs when a raster object is resampled by using the average resampling method.
The following issue is fixed: If the trajectory points for multiple timestamps are the same in a trajectory object, query results may be invalid.
The following issue is fixed: The conversion process is terminated after a GEOS object fails to be converted. After this issue is fixed, the system also prompts the causes of the conversion failure.

Minor version of the kernel (V1.1.9)

Category Feature Description References
Added features Automatic Workload Repository (AWR) for performance monitoring AWR is supported. AWR collects and analyzes performance statistics. You can use AWR to generate an analytical report for a specified period based on statistics such as dynamic views of a database. This allows you to analyze the database performance within the specified period. None
Optimized features WAL The pipeline technology is supported. This technology is used to reduce the proportion of WAL overhead. This can improve overall system performance. None
Fixed issues Invalid SIGHUP signals are deleted.
The following issue is fixed: The return values of functions are truncated because the functions are not declared in the Transparent Data Encryption (TDE) feature.
The following issue is fixed: The roaringbitmap plug-in encounters an "illegal memory access" error when invalid parameters are specified.
The following issue is fixed: If the synchronization latency is high when logs are synchronized from a primary node to read-only nodes, the read-only nodes may not immediately give feedback on streaming replication to the primary node. As a result, the streaming replication is interrupted.

Ganos (V3.4)

Category Feature Description References
Added features Storage optimization for large spatio-temporal objects The feature signatures of large spatio-temporal objects are used. This accelerates the process of creating indexes on spatio-temporal data, makes spatial queries more efficient, and optimizes the storage modes of spatio-temporal objects. The polar_enable_storage_partial parameter is also supported. You can specify this parameter to enable the metadata of spatio-temporal objects to be stored in-row and the entity data of spatio-temporal objects to be stored off-row. Feature signature-based storage optimization for large spatio-temporal objects
Parallel execution of functions supported by the raster module The ST_ImportFrom function is supported. This function is used to import raster data in parallel. ST_ImportFrom
The ST_BuildPyramid function is supported. This function is used to create pyramids in parallel based on raster data. ST_BuildPyramid
Trajectory Empty The Trajectory Empty object is supported. This allows null objects to be returned if requirements are not met in some scenarios. None
Fixed issues The following issue is fixed: When the input parameter is a 16-bit signed integer (16BSI), the ST_AddZ function may return an invalid result.
The following issue is fixed: In some cases, the trajectory module fails to be upgraded.
The following issue is fixed: Some functions cannot use indexes in the trajectory module.
The following issue is fixed: An error instead of the value false is returned by some nd functions. This issue may occur if these nd functions fail to resolve the problem that two time periods do not intersect.

January 2021

Minor version of the kernel (V1.1.8)

Category Feature Description References
Optimized features PBP By default, the persistent buffer pool for a primary node is enabled. None
Fixed issues The following issue is fixed: When logical replication is used to synchronize DBMS_JOB tables that do not have primary keys, tasks fail to be deleted.
The following issue is fixed: A memory leak occurs in the processes of resource groups if the memory usage exceeds the upper limit.

Ganos (V3.3)

Category Feature Description References
Added features ST_JaccardSimilarity function The ST_JaccardSimilarity function is supported. This function is used to calculate the similarity between trajectory objects. ST_JaccardSimilarity
ST_Transform function The ST_Transform function is supported. This function is used to transform the coordinate of a trajectory between spatial reference systems. ST_Transform
Optimized features Vector pyramid The spatial extent can be specified when you create a vector pyramid. This fixes the issue that the spatial extent of a vector pyramid cannot be automatically calculated in some scenarios. None
Fixed issues The following issue is fixed: Ganos data catalogs are misconfigured in some environments.

December 2020

Minor version of the kernel (V1.1.7)

Category Feature Description References
Added features Compatibility This kernel version is compatible with PostgreSQL 11.9.20. None

Ganos (V3.2)

Category Feature Description References
Added features ST_AsPNG BYTEA-type images can be returned for vector pyramids. This feature can be used to visualize vector data. ST_AsPNG
Raster data The JPEG 2000 compression algorithm is supported. This algorithm is used to compress 16-bit raster data before the data is stored. None
Optimized features st_dwithin The ST_DWithin function is optimized to improve the performance of distance queries. None
Fixed issues The following issue is fixed: The intersection of trajectories on the t axis is improper.
The issues related to the memory topology indexes that are supported by Ganos are fixed.

November 2020

Minor version of the kernel (V1.1.6)

Category Feature Description References
Added features Compatibility This kernel version is compatible with PostgreSQL 11.9. None
Failover By default, the OnlinePromote feature is enabled. This feature reduces the amount of time that is consumed by a failover and improves cluster availability. Perform a switchover
Fixed issues The following issue is fixed: A node does not restart smoothly in some scenarios.
The following issue is fixed: In some scenarios, instances do not respond due to OOM errors.
The following issue is fixed: In some scenarios, read-only nodes do not respond.

October 2020

Ganos (V3.1)

Category Feature Description References
Added features Trajectory data type GiST indexes are supported for trajectories. In addition, six operator families of different dimensions are provided to meet multi-dimensional analysis requirements. None
The BoxND data type is supported. This data type is used to describe the bounding box of a spatio-temporal extent or a storage trajectory. None
The following operators are supported: the && operator, the @> operator, and the <@ operator. These operators are used to compare the spatio-temporal relationships between two specified objects from various dimensions. The && operator is used to check whether the two specified objects intersect. The @> operator is used to check whether the left operand-specified object includes the right operand-specified object. The <@ operator is used to check whether the left operand-specified object is included in the right operand-specified object. None
The ST_ndIntersects, ST_ndDWithin, ST_ndContains, and ST_ndWithin functions are supported to process trajectories.
Trajectory statistics can be collected. Scan costs can be estimated based on these trajectory statistics. None
TrajGist indexes are supported. This provides an optimized indexing method. None
ganos_update function The ganos_update function is supported. You can run the select ganos_update() ; command to update all Ganos extensions to the latest version. None
Optimized features Spatio-temporal range query Spatio-temporal range queries are optimized. The query performance is improved by using optimized GiST index-based two-phase queries. None
Vector pyramid Source data from all the coordinate systems that provide spatial reference identifiers (SRIDs) is supported. The source data can be tiles that are based on the EPSG:3857 or EPSG:4326 coordinate reference system. None
The pixelSize parameter is supported. This parameter is used to aggregate point data and reduce the number of tiles. None
Fixed issues The following issue is fixed: Ganos rasters fail to be updated in some scenarios.
The following issue is fixed: An unexpected exit may occur after the binary files of Ganos are upgraded to later versions.
The following issue is fixed: The data volume of top-level tiles is excessively large after the point data of vector pyramids is built by using the default parameters.

September 2020

Minor version of the kernel (V1.1.4)

Category Feature Description References
Added features ali_decoding plug-in The ali_decoding plug-in is supported. This plug-in is used to synchronize incremental DML statements between databases. None
View The views that display process status statistics are added. None
The views that display time consumption statistics for SQL statements are added. None
Audit logs SQL errors are recorded in audit logs. None
Fixed issues The following issue is fixed: In specific scenarios, page prefetching may cause deadlocks.
The following issue is fixed: A JOIN query fails to retrieve the accurate partition during partition pruning.

Ganos (V3.0)

Category Feature Description References
Added features Support for the subset raster in a NetCDF raster file that has multiple subsets The subset raster in a NetCDF raster file that has multiple subsets can be imported. You can specify the subset name to import the subset raster. None
Custom metadata and time series information of rasters The ST_MetaItems function is supported. This function is used to obtain the names of all custom metadata items. ST_MetaItems
The ST_MetaData function is supported. This function is used to obtain custom metadata items of a raster and return custom metadata items in the JSON format. ST_MetaData
The ST_SetMetaData function is supported. This function is used to specify a metadata item. ST_SetMetaData
The ST_BeginDateTime function is supported. This function is used to obtain the start time of a raster. ST_BeginDateTime
The ST_EndDateTime function is supported. This function is used to obtain the end time of a raster. ST_EndDateTime
The ST_SetBeginDateTime function is supported. This function is used to configure the start time of a raster. ST_SetBeginDateTime
The ST_SetEndDateTime function is supported. This function is used to configure the end time of a raster. ST_SetEndDateTime
The ST_SetDateTime function is supported. This function is used to configure the start time and end time of a raster and the time when a band is obtained. ST_SetDateTime
Support for converting a raster into a BYTEA-type image The ST_AsImage function is supported. This function is used to convert a raster into a BYTEA-type image. ST_AsImage
The ST_AsPng function is supported. This function is used to convert a raster into a BYTEA-type PNG image. ST_AsPNG
The ST_AsJPEG function is supported. This function is used to convert a raster into a BYTEA-type JPEG image. ST_AsJPEG
Support for the GeomGrid data type and operations The GeomGrid data type is supported. GeomGrid SQL reference
The ST_AsText function is supported. This function is used to convert a grid into a text representation. ST_AsText
The ST_AsGeometry function is supported. This function is used to obtain the geometric representation of a grid. ST_AsGeometry
The ST_AsBinary function is supported. This function is used to convert a grid into a binary representation. ST_AsBinary
The ST_AsBox function is supported. This function is used to obtain the box representation of a grid. ST_AsBox
The ST_AsGrid function is supported. This function is used to query the grids that intersect with a geometric object. ST_AsGrid
The ST_GridFromText function is supported. This function is used to convert a grid from a text representation into a GeomGrid representation. ST_GridFromText
The ST_GridFromBinary function is supported. This function is used to convert a grid from a binary representation into a GeomGrid representation. ST_GridFromBinary
The ST_Intersects function is supported. This function is used to identify the spatial relationship between two raster objects or between a raster object and a geometric object. This function allows you to check whether the first specified object intersects with the second specified object. ST_Intersects
The ST_Contains function is supported. This function is used to identify the spatial relationship between two raster objects or between a raster object and a geometric object. This function allows you to check whether the first specified object contains the second specified object. ST_Contains
The ST_Within function is supported. This function is used to identify the spatial relationship between two grid objects or between a grid object and a geometric object. This function allows you to check whether the first specified object is within the second specified object. ST_Within
Rapid display and storage of vector data The ST_BuildPyramid function is supported. This function is used to create a vector pyramid. ST_BuildPyramid
The ST_DeletePyramid function is supported. This function is used to delete a vector pyramid. ST_DeletePyramid
The ST_Tile function is supported. This function is used to obtain vector data in the MVT format. ST_Tile
Fixed issues The following issue is fixed: In some cases, OOM errors occur when you create pyramids.
The following issue is fixed: Trajectory objects on January 1, 2000 cannot be created.
The following issue is fixed: In some scenarios, an invalid trajectory is returned when the ST_Intersection function is used for trajectory objects.
The following issue is fixed: The system stops responding during a Ganos upgrade.
This kernel version is compatible with PostGIS 2.5.4.

August 2020

Minor version of the kernel (V1.1.3)

Category Feature Description References
Added features View The views that display SQL execution statistics are added. None
The views that display queries per second (QPS) statistics are added. None
The views that display CGroup status statistics are added. None
Fixed issues The following issue is fixed: An error occurs when the Segmented Least Recently Used (SLRU) algorithm is used to calculate the memory size.
The following issue is fixed: Read-only nodes are recreated due to a playback latency.

Ganos (V2.9)

Category Feature Description References
Added features Support for Cloud Optimized GeoTIFF (COG) files The COG files are supported. The pyramid information that is stored in COG files can be read. None
ST_AddZ function The ST_AddZ function is supported. This function is used to specify the Z coordinate of a geometry object based on the pixel value of the raster that is converted from the geometry object. ST_AddZ
Enhanced capabilities for obtaining the spatial extent information about raster objects The ST_Extent function is supported. This function is used to retrieve the spatial extent of a raster object and return the box representation of the raster object. ST_Extent
The ST_Envelope function is supported. This function is used to retrieve the spatial extent of a raster object and return the spatial extent in the format of a geometry object. ST_Envelope
The ST_ConvexHull function is supported. This function is used to retrieve the spatial extent of a raster object and return the spatial extent in the format of a geometry object. ST_ConvexHull
The ST_Height function is supported. This function is used to retrieve the pixel height of a raster object. ST_Height
The ST_Width function is supported. This function is used to retrieve the pixel width of a raster object. ST_Width
Fixed issues The following issue is fixed: Performance bottlenecks occur when raster objects that are stored in external storage locations use the chunking dimension of 1 × n. You can configure storage parameters to customize the size of the chunking dimension.
The following issue is fixed: The returned values are different from the coordinate values when you use the ST_Values function to obtain values in some directions.
The following issue is fixed: In some cases, the ST_BestPyramidLevel function returns a negative value.
The following issue is fixed: In some cases, the ST_BuildPyramid function repeatedly creates pyramids.
The following issue is fixed: The block table of a raster table is not deleted when you truncate the raster table.
The following issue is fixed: The ST_ExportTo function is invalid for CreateOption in some cases.
The following issue is fixed: If a table name contains uppercase and lowercase letters, the ST_ClearChunks function fails.
The following issue is fixed: In some cases, an external pyramid cannot create an overview.
The following issue is fixed: Raster objects that have external pyramids cannot create internal pyramids.
The following issue is fixed: Invalid results are returned when you calculate the raster data that contains NaN values.

July 2020

Minor version of the kernel (V1.1.2)

Category Feature Description References
Added features Temporary table Temporary tables can be written to local storage. This improves the read and write performance of temporary tables. None
Event trigger Logical replication can be performed on events captured by the event trigger. Accounts that have the polar_superuser permissions can perform logical replication. None
Custom resource group Requests can be initiated by custom resource groups. None
Optimized features Process of recovery from a failure The process to recover from a failure is optimized. This reduces the amount of time that is required to recover from a failure in extreme cases. None
Fixed issues The following issue is fixed: Accounts that have the polar_superuser permissions cannot use the Index Advisor.

Ganos (V2.8)

Category Feature Description References
Added features Enhanced interfaces that are used to access raster metadata The ST_XMin function is supported. This function is used to obtain the minimum value in a set of rasters on the X-axis. ST_XMin
The ST_YMin function is supported. This function is used to obtain the minimum value in a set of rasters on the Y-axis. ST_YMin
The ST_XMax function is supported. This function is used to obtain the maximum value in a set of rasters on the X-axis. ST_XMax
The ST_YMax function is supported. This function is used to obtain the maximum value in a set of rasters on the Y-axis. ST_YMax
The ST_ChunkHeight function is supported. This function is used to obtain the height of a raster tile. ST_ChunkHeight
The ST_ChunkWidth function is supported. This function is used to obtain the width of a raster tile. ST_ChunkWidth
The ST_ChunkBands function is supported. This function is used to obtain the number of bands of a raster tile. ST_ChunkBands
ST_SrFromEsriWkt function The ST_SrFromEsriWkt function is supported. This function is used to convert the format of a spatial reference string from Esri into Open Geospatial Consortium (OGC). ST_SrFromEsriWkt
Raster data type Raster data files can be compressed by using the Zstandard (zstd) compression algorithm or the Snappy compression library. None
Point cloud data type Point cloud files can be copied in binary mode. None
Environment variable The PROJ_LIB and GDAL_DATA environment variables can be configured, and the relevant data can be deployed. None
Fixed issues The following issue is fixed: Databases do not respond due to invalid OSS paths.
The following issue is fixed: After raster data is imported to databases, the SRIDs of some raster data are inconsistent with the original SRIDs.

June 2020

Minor version of the kernel (V1.1.1)

Category Feature Description References
Added features polar_proxy_utils plug-in The polar_proxy_utils plug-in is supported. This plug-in is used to manage proxy-related features. This plug-in allows you to configure read-only Universal Disk Format (UDF) files and read-only tables. This plug-in also allows you to use a cluster endpoint to route requests for accessing read-only UDF files and read-only tables to the read-only nodes in the cluster. None
polar_resource_group plug-in The polar_resource_group plug-in is supported. This plug-in is used to customize resource groups. You can use the custom resource groups to isolate resources such as CPUs and memory on a per-user, per-database, or per-session basis. None
Optimized features Reliability and availability The compute nodes of databases are decoupled from file systems. This allows you to perform O&M operations on the file systems. This improves the reliability and availability of databases. None
Transaction processing The snapshot of the active transaction list is replaced with a commit sequence number (CSN). Each CSN is a monotonically increasing identifier. This improves the transaction processing performance of databases. None
Execution plan Execution plans are optimized to prevent obsolete statistics from being used. None
Fixed issues The following issue is fixed: A database process failure occurs when the timescaledb plug-in fails to request memory resources.
The following issue is fixed: The I/O monitoring feature does not provide data statistics after a process exits.
The following issue is fixed: A null pointer exception may occur after lock_debug is enabled.
The following issue is fixed: In specific cases, the pg_cron plug-in becomes unavailable.
Known issues of distributed shared memory (DSM) deadlocks in the PostgreSQL Community Edition are fixed.
The following issue is fixed: The number of connections exceeds the upper limit.

May 2020

Minor version of the kernel (V1.1.0)

Category Feature Description References
Added features polar_concurrency_control plug-in The polar_concurrency_control plug-in is supported. This plug-in is used to configure a concurrency limit on transaction executions, SQL queries, stored procedures, and DML operations. You can customize large queries and configure a concurrency limit on large queries to improve the execution efficiency in high concurrency scenarios. None
oss_fdw plug-in The oss_fdw plug-in is supported. This plug-in is used to support external tables of Alibaba Cloud OSS. You can use OSS external tables to write data of databases to OSS or load data from OSS to databases. You can use multiple external tables in parallel or compress data during imports and exports. This improves the performance of data imports and exports. You can also use this feature to separate hot data and cold data that are stored in a wide range of storage media. Read and write external data files by using oss_fdw
Optimized features polar_stat_activity view The polar_stat_activity view is optimized. The wait_info and wait_time columns are added. The wait_info column displays the object for which the current process is waiting. The wait_time column displays the amount of time for which the process needs to wait. If the object is a process, the process identifier (PID) is displayed. If the object is a file, the file descriptor (FD) is displayed. None
Index The pre-extension feature is supported. This feature automatically adds additional index pages when index pages are insufficient for new indexes. This improves the execution performance when data is inserted into a table that has indexes. None

Ganos (V2.7)

Category Feature Description References
Added features MD5 functions The ST_MD5Sum function is supported. This function is used to obtain the MD5 hash value of a raster object. ST_MD5Sum
The ST_SetMD5Sum function is supported. This function is used to configure the MD5 hash value of a raster object. ST_SetMD5Sum
Authentication method of spatial raster objects that are stored in OSS The ST_AKId function is supported. This function is used to obtain the AccessKey ID that is used to access a raster object stored in OSS. ST_AKId
The ST_SetAccessKey function is supported. This function is used to configure the AccessKey ID and the AccessKey secret that are used to access a raster object stored in OSS. ST_SetAccessKey
The ST_SetAKId function is supported. This function is used to configure the AccessKey ID that is used to access a raster object stored in OSS. ST_SetAKId
The ST_SetAKSecret function is supported. This function is used to configure the AccessKey secret that is used to access a raster object stored in OSS. ST_SetAKSecret
Functions that are used to manage spatial raster metadata The ST_ScaleX function is supported. This function is used to obtain the pixel width of a raster object on the X-axis of the spatial reference system. ST_ScaleX
The ST_ScaleY function is supported. This function is used to obtain the pixel width of a raster object on the Y-axis of the spatial reference system. ST_ScaleY
The ST_SetScale function is supported. This function is used to configure the pixel width of a raster object in the spatial reference system. ST_SetScale
The ST_SkewX function is supported. This function is used to obtain the skew of a raster object on the X-axis of the spatial reference system. ST_SkewX
The ST_SkewY function is supported. This function is used to obtain the skew of a raster object on the Y-axis of the spatial reference system. ST_SkewY
The ST_SetSkew function is supported. This function is used to specify the skew of a raster object in the spatial reference system. ST_SetSkew
The ST_UpperLeftX function is supported. This function is used to obtain the upper-left X-coordinate of a raster object in the spatial reference system. ST_UpperLeftX
The ST_UpperLeftY function is supported. This function is used to obtain the upper-left Y-coordinate of a raster object in the spatial reference system. ST_UpperLeftY
The ST_SetUpperLeft function is supported. This function is used to configure the upper-left coordinates of a raster object in the spatial reference system. ST_SetUpperLeft
The ST_PixelWidth function is supported. This function is used to obtain the pixel width of a raster object in the spatial reference system. ST_PixelWidth
The ST_PixelHeight function is supported. This function is used to obtain the pixel height of a raster object in the spatial reference system. ST_PixelHeight
Fixed issues The following issue is fixed: Aggregate functions result in extension upgrade failures.