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a147079043
BigQuery rejects filter values containing apostrophes (e.g. O'Brien): the
sqlalchemy-bigquery dialect renders string literals via repr(), which switches
to double-quote delimiters that BigQuery parses as identifiers, causing a
syntax error.
Monkey-patch the dialect's colspecs with a TypeDecorator whose literal_processor
emits single-quoted literals using backslash escaping ('O\'Brien'). Doubled
single quotes ('O''Brien') are NOT valid in BigQuery (parsed as concatenated
literals). Control characters are emitted as named escapes with a \xhh fallback,
since BigQuery forbids literal control chars in quoted strings. Follows the
existing Databricks dialect pattern.
Fixes #35857