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BigQuery has no DAY_OF_WEEK function, so MySQL/Spark DAYOFWEEK(x) used to transpile to invalid BigQuery SQL. Both use Sunday=1..Saturday=7, which matches BigQuery's EXTRACT(DAYOFWEEK FROM x). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Fixes #8767
BigQuery has no DAY_OF_WEEK function, so DAYOFWEEK read from MySQL or Spark was transpiled to invalid BigQuery SQL. All three dialects number days Sunday=1 to Saturday=7, so this maps DayOfWeek to EXTRACT(DAYOFWEEK FROM x), the same way DayOfYear and DayOfMonth are already handled. Added a BigQuery case to the existing MySQL DAYOFWEEK test.
Disclosure: found, reproduced and the draft fix tested locally with the help of an AI coding agent (Claude Code); reviewed before filing.
🤖 Generated with Claude Code