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30487e8854
The secondary index mechanism is currently used to determine the target column. This mechanism works incorrectly for vector indexes with filtering because it returns the last specified column as the target (vectors) column. However, the syntax for a vector index requires the first column to be the target: ``` CREATE CUSTOM INDEX ON t(vectors, users) USING 'vector_index'; ``` This discrepancy eventually leads to the following exception when performing an ANN search on a vector index with filtering columns: ```` ANN ordering by vector requires the column to be indexed using 'vector_index' ```` This commit fixes the issue by introducing dedicated logic for vector indexes to correctly identify the target(vectors) column. Fixes: SCYLLADB-635 Closes scylladb/scylladb#28740