[jira] [Created] (IMPALA-10948) Impala shouldn't require DECIMAL scale for Parquet files

["Zoltán Borók-Nagy (Jira)" <ji...@apache.org>]

Zoltán Borók-Nagy created IMPALA-10948:
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             Summary: Impala shouldn't require DECIMAL scale for Parquet files
                 Key: IMPALA-10948
                 URL: https://issues.apache.org/jira/browse/IMPALA-10948
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
            Reporter: Zoltán Borók-Nagy


Impala requires the 'scale' to be set for decimal columns: https://github.com/apache/impala/blob/1a61a8025c87c37921a1bba4c49f754d8bd10bcc/be/src/exec/parquet/parquet-metadata-utils.cc#L332

But it is only an optional field in Parquet's [SchemaElement|https://github.com/apache/parquet-format/blob/master/src/main/thrift/parquet.thrift#L392] and the [docs|https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#decimal] says that if the scale is unspecified then it should be considered to be 0.

Then there's the new logical type annotation [DecimalType|https://github.com/apache/parquet-format/blob/master/src/main/thrift/parquet.thrift#L253], but Impala doesn't use it during scans.



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