Extract vector_indexed_table_select_statement and its filter logic out of
the monolithic select_statement.cc and vector_search/ module into a
dedicated directory cql3/statements/index_search/.
This improves modularity and eliminates a circular dependency between cql3
and vector_search: the filter code depends heavily on cql3 types
(expressions, query_options, statement_restrictions) and belongs in the cql3
layer. Follow-up to VECTOR-250 which originally addressed the same
dependency but has since regressed.
This is also a preparatory refactoring for full-text search select statements,
which can share some implementation with the vector search.
Pure refactoring, no semantic changes - no need for backporting.
Closesscylladb/scylladb#30100
* github.com:scylladb/scylladb:
vector_index: move filter into cql3/statements/external_search
cql3: extract vector_indexed_table_select_statement into own compilation unit
vector_index: split query_base_table to return raw coordinator_result
7a387a499f