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[python] SQL CLI JSON output fails for TIMESTAMP and loses BIGINT precision - #11107
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Purpose
Fixes #11106.
paimon sql --format jsonfails on TIMESTAMP results and rounds nullable BIGINT values while emittingNaNfor SQLNULL. Serialize Arrow scalars directly and format timestamps as ISO 8601 strings, preserving fractional seconds and timezone offsets, including the minimum nanosecond timestamp.Tests
python -m pytest -q paimon-python/pypaimon/tests/cli_sql_test.py(8 passed on each of PyArrow 16.1.0, 19.0.1, and 22.0.0).