SingleStore vector search needs the query vector as a runtime constant

SingleStore vector search needs the query vector as a runtime constant

TL;DR

If your SingleStore vector search errors or plans badly when the query vector comes from application code, make it a runtime constant first. Do SET @queryvec = JSONARRAYPACK('[0.44, 0.554, 0.34, 0.62]'); then SELECT EUCLIDEANDISTANCE(vec, @queryvec) AS score FROM vectorsb ORDER BY score ASC LIMIT 10. Pack the constant once per session, not per row or per query execution.

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Details

Also set vectortypeproject_format = JSON when you want vector columns to print readably in results instead of binary.

Context: Official docs (SingleStore EUCLIDEANDISTANCE reference): documents a query-shape gotcha that trips agents building parameterized search. The query vector in a vector search (@queryvector) must be a runtime constant. The documented pattern is SET @queryvec = JSONARRAY_PACK('[...]') once, then SELECT ... WHERE ... ORDER BY score LIMIT k against that variable. Inline JSON constants in the SELECT work for one-off queries, but for repeated queries SingleStore recommends casting the JSON string to a VECTOR once and reusing it.