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feat(snowflake): Transpile exp.DatetimeDiff - #4334
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…no [CLAUDE] (#7895) * Fix TIMESTAMP_DIFF/DATETIME_DIFF transpilation to Presto/Trino [CLAUDE] Presto and Trino only have date_diff(unit, ts1, ts2); they have no TIMESTAMPDIFF, DATETIME_DIFF or TIMESTAMP_DIFF. sqlglot maps exp.DateDiff to DATE_DIFF for Presto, but exp.TimestampDiff and exp.DatetimeDiff (produced by e.g. BigQuery TIMESTAMP_DIFF/DATETIME_DIFF) had no Presto/Trino handler and fell through to the generic function fallback, emitting the node name verbatim with the unit-last arg order - invalid, unparseable SQL. Route all three diff nodes through DATE_DIFF(unit, expression, this) for Presto (Trino inherits it). date_diff(unit, ts1, ts2) = ts2 - ts1, so (expression, this) preserves the source's a - b semantics, matching what DATE_DIFF and DuckDB already produce (cf. merged #6126, #4334). * Update tests/dialects/test_bigquery.py --------- Co-authored-by: Jo <[email protected]>
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Transpile BQ's
DATETIME_DIFFinto Snowflake'sTIMESTAMPDIFF. Both functions can process different date/time types, so the solution here should be a catch-all, e.g:DATETIME->TIMESTAMPdiffDATE->DATEdiffDocs
BQ DATETIME_DIFF | SF TIMESTAMPDIFF