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Vladislav Kuzmin bf1b2cdcf9 fix(duckdb): cast list columns in quicksearch so tables containing them can be previewed (#10614 )

* fix(duckdb): cast columns in quicksearch so nested types can be previewed

DuckDB's `CONCAT` implicitly casts scalars but rejects nested types:

    D SELECT CONCAT(' ', ['a','b']);
    Binder Error: Cannot concatenate types VARCHAR and VARCHAR[] - an explicit
    cast is required

Quicksearch concatenates every visible column, so one LIST, STRUCT or MAP column
makes a table impossible to preview — both the grid and its row count fail:

    Binder Error: Cannot concatenate types VARCHAR, VARCHAR, BIGINT, ...,
    VARCHAR[], ... and TIMESTAMP WITH TIME ZONE - an explicit cast is required
    LINE 1: ... FROM "raw"."accounts" WHERE ($1 = '' OR CONCAT(' ', "id", ...

Every scalar in that list concatenates fine on its own — VARCHAR, BIGINT,
DOUBLE, BOOLEAN, DATE and TIMESTAMPTZ were each checked individually — so the
array column is the entire cause.

Cast each column in the predicate. The comparison is textual either way, so no
result changes, and the projection is untouched: casting there would change the
types the caller reads back. This follows the shape already used for MSSQL in
`mssql_needs_cast_for_eq`.

Both DuckDB quicksearch sites are covered, SELECT and COUNT. Fixing one leaves
the grid rendering while the row count still errors.

Tests include the live path: the Database Manager sends a
`-- WM_INTERNAL_DB_SELECT {...}` marker and the backend expands it, so the new
test drives that expansion with the real 27-column definition captured from a
failing job, `sync_id VARCHAR[]` included. It fails without the fix and passes
with it.

* fix(frontend): cast columns in the DuckDB quicksearch

Same defect as the Rust query builders, in the implementation that actually
runs. `make_select_query` / `make_count_query` in windmill-common have no callers
anywhere in the repo; the query the browser sends is built here.

DuckDB's CONCAT implicitly casts scalars but rejects nested types, and
quicksearch concatenates every visible column, so one LIST column makes a table
impossible to preview — both the page and its row count fail with

    Binder Error: Cannot concatenate types VARCHAR, ..., VARCHAR[], ... and
    TIMESTAMP WITH TIME ZONE - an explicit cast is required

The helper lives in select.ts and is imported by count.ts so the two cannot
drift, and both call sites are fixed: fixing only SELECT leaves the grid
rendering while the row count still errors.

* fix(duckdb): cast only list columns in quicksearch, leaving other SQL byte-identical

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* test(frontend): pin the DuckDB quicksearch column list byte-for-byte

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Ruben Fiszel <ruben@windmill.dev>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-10 20:48:19 +02:00