Csaba Ringhofer created IMPALA-9385:
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Summary: Orc scanner does UTC->local conversion of
use_local_tz_for_unix_timestamp_conversions=1
Key: IMPALA-9385
URL: https://issues.apache.org/jira/browse/IMPALA-9385
Project: IMPALA
Issue Type: Bug
Components: Backend
Reporter: Csaba Ringhofer
https://github.com/apache/impala/blob/cad156181b29b7897fb2366bd621f2349c090e20/be/src/exec/orc-column-readers.cc#L195
Orc scanner uses TimestampValue::FromUnixTimeNanos() to convert sec + nano
representation to Impala's TimestampValue (day + nano). That function is
affected by flag use_local_tz_for_unix_timestamp_conversions, while that global
option should not affect Orc (Parquet has its own related flag
convert_legacy_hive_parquet_utc_timestamps, I hope we won't need such hacks for
Orc).
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