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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (JIRA)" <ji...@apache.org> on 2018/11/15 16:20:00 UTC
[jira] [Created] (IMPALA-7853) Add support to read int64 NANO
timestamps to the parquet scanner
Csaba Ringhofer created IMPALA-7853:
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Summary: Add support to read int64 NANO timestamps to the parquet scanner
Key: IMPALA-7853
URL: https://issues.apache.org/jira/browse/IMPALA-7853
Project: IMPALA
Issue Type: Improvement
Components: Backend
Reporter: Csaba Ringhofer
Assignee: Csaba Ringhofer
PARQUET-1387 added int64 timestamps with nanosecond precision.
As 64 bits are not enough to represent the whole 1400..9999 range of Impala timestamps, so this new new type works with a limited range:
1677-09-21 00:12:43.145224192 .. 2262-04-11 23:47:16.854775807 UTC
The benefit of the reduced range is that no validation is necessary during scanning, as every possible 64 bit value represents a valid timestamp in Impala. This may mean that this has the potential be the fastest way to store timestamps.
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