fix(MagicMapper): CAST(col AS CHAR) for MariaDB in UNION queries

[remko48]

Fix: MariaDB 500 error when fetching publications from a multi-schema catalog

Problem

When a catalog contained more than one schema, fetching publications failed with:

SQLSTATE[42000]: Syntax error or access violation: 1064
You have an error in your SQL syntax … near '::text AS `title`,
`kenmerk`::text AS `kenmerk`, `publicatiedatum`::text …'

Multi-schema catalogs trigger a UNION query so that results from every schema's table can be combined in a single result set. Each SELECT arm must expose the same columns, so buildUnionSelectPart() casts every column to a common text type. The method correctly detected the database platform ($isPostgres), but then ignored that flag and hardcoded PostgreSQL's ::text cast syntax unconditionally — syntax that MariaDB does not support.

Root cause

buildUnionSelectPart() in MagicMapper.php:

// before — always emits ::text regardless of database
$colExpr = "NULL::text AS {$quotedCol}";
$colExpr = "{$quotedCol}::text AS {$quotedCol}";

The same pattern already existed correctly in MagicFacetHandler.php, which uses CAST(x AS CHAR) for MariaDB and x::text only for PostgreSQL.

Fix

Both the column cast expressions and the search relevance score expressions now branch on $isPostgres:

Database	Column cast	Search score
PostgreSQL	col::text	ILIKE / similarity() (pg_trgm)
MariaDB/MySQL	CAST(col AS CHAR)	LIKE

Files changed

• lib/Db/MagicMapper.php — buildUnionSelectPart(): column casts and search score expressions are now database-aware

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