[python][ray] Pin merge source table snapshot#8110
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Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
Ray merge-into already pins target reads to the base snapshot, but Paimon source tables were still normalized through
read_paimonwithout an explicit snapshot. Because Ray Dataset execution is lazy, source planning could otherwise observe a later table snapshot than the one seen during merge preparation.This PR captures the latest snapshot id for string source tables during
_prepareand passes it toread_paimon, so the source side uses a stable snapshot throughout merge planning and execution.Tests
python -m pytest paimon-python/pypaimon/tests/ray_data_evolution_merge_into_test.py -q