[IMPALA-9385] Orc scanner does UTC->local conversion if use_local_tz_for_unix_timestamp_conversions=1

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 3.4.0
• Component/s: Backend
• Labels: Orc
• Epic Color: ghx-label-12
• Assignee: Csaba Ringhofer
• Reporter: Csaba Ringhofer
• Created: 14/Feb/20 16:49
• Updated: 18/Mar/20 14:34
• Resolved: 18/Mar/20 14:34

Description

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).