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BigQuery returns DATETIME and TIMESTAMP values as microsecond Arrow
data, which to_pyarrow keeps. to_polars then cast the result to the
ibis schema, where a timestamp without a scale maps to Datetime("ns"),
so the columns came back as nanoseconds. Treat unscaled timestamps as
microseconds when converting a BigQuery result to polars.
Fixes ibis-project#11790
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Description of changes
BigQuery returns DATETIME and TIMESTAMP values as microsecond Arrow
data, which to_pyarrow keeps. to_polars then cast the result to the
ibis schema, where a timestamp without a scale maps to Datetime("ns"),
so the columns came back as nanoseconds. Treat unscaled timestamps as
microseconds when converting a BigQuery result to polars.
Issues closed
This PR is a joint contribution from Nilanjan Chatterjee and Claude (Claude Opus 5.5, via Claude Code). Nilanjan chose the issue and directed the work; Claude reproduced the problem, wrote the change, its tests and this description.
Authored by Nilanjan Chatterjee (@nil68657).