AnalyticDB:QueryContent

Instance ID.

Namespace, default is public.

Document collection name.

The region ID where the instance is located.

Password for the namespace.

Text content for retrieval.

Filter condition for the data to be queried, in SQL WHERE format. It is an expression that returns a boolean value (true or false). The conditions can be simple comparison operators such as equal (=), not equal (<> or !=), greater than (>), less than (<), greater than or equal to (>=), less than or equal to (<=), or more complex expressions combined with logical operators (AND, OR, NOT), and conditions using keywords like IN, BETWEEN, LIKE, etc.

Recall window. When this value is not empty, it adds context to the returned search results. The format is an array of 2 elements: List<A, B>, where -10 <= A <= 0 and 0 <= B <= 10.

The number of the returned top results.

Re-ranking factor. When this value is not empty, it will re-rank the vector search results. The value range is 1 < RerankFactor <= 5.

Whether to use full-text retrieval (dual recall). Default is false, which means only vector retrieval is used.

Similarity algorithm used during retrieval. If this value is empty, the algorithm specified at the time of knowledge base creation is used. It is recommended not to set this unless there is a specific need.

In image search scenarios, the source file name of the image to be searched.

In image search scenarios, the publicly accessible URL of the image file.

Whether to return vectors. Default is false.

Dual recall algorithm, default is empty (i.e., directly compare and sort the scores of vectors and full text).

Available values:

• RRF: Reciprocal rank fusion, with a parameter k controlling the fusion effect. See HybridSearchArgs configuration for details;
• Weight: Weighted ranking, using a parameter alpha to control the weight of vector and full-text scores, then sorting. See HybridSearchArgs configuration for details;
• Cascaded: Perform full-text retrieval first, then vector retrieval on top of it;

The parameters of the two-way retrieval algorithm. The following parameters are supported:

• When HybridSearch is set to RRF, the scores are calculated by using the 1/(k+rank_i) formula. The constant k is a positive integer that is greater than 1.

{ 
   "RRF": {
    "k": 60
   }
}

• When HybridSearch is set to Weight, the scores are calculated by using the alpha * vector_score + (1-alpha) * text_score formula. The alpha parameter specifies the proportion of the vector search score and the full-text search score and ranges from 0 to 1. A value of 0 specifies full-text search and a value of 1 specifies vector search.

{ 
   "Weight": {
    "alpha": 0.5
   }
}

The metadata fields to be returned. Separate multiple fields with commas (,). This parameter is empty by default.

Specifies whether to return the URL of the document. Default value: false.

The validity period of the returned image URL.

• Supported units are seconds (s) and days (d). For example, 300s specifies that the URL is valid for 300 seconds, and 60d specifies that the URL is valid for 60 days.

• Valid values: 60s to 365d.

• Default value: 7200s, that is, 2 hours.

Whether to enable knowledge graph enhancement. Default value: false.

The search parameters of the knowledge graph.

The fields by which to sort the results. This parameter is empty by default.

The field must be either a metadata field or a default field in the table (e.g., id). Supported formats include:

Single field, such as chunk_id. Multiple fields that are separated by commas (,), such as block_id,chunk_id. Descending order is supported, e.g., block_id DESC, chunk_id DESC.

Offset, used for paginated queries.