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https://issues.apache.org/jira/browse/IMPALA-7087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16934637#comment-16934637
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Sahil Takiar commented on IMPALA-7087:
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This was partially implemented here: [https://gerrit.cloudera.org/#/c/12163/]
> Impala is unable to read Parquet decimal columns with lower precision/scale
> than table metadata
> -----------------------------------------------------------------------------------------------
>
> Key: IMPALA-7087
> URL: https://issues.apache.org/jira/browse/IMPALA-7087
> Project: IMPALA
> Issue Type: Sub-task
> Components: Backend
> Reporter: Tim Armstrong
> Assignee: Sahil Takiar
> Priority: Major
> Labels: decimal, parquet
>
> This is similar to IMPALA-2515, except relates to a different precision/scale
> in the file metadata rather than just a mismatch in the bytes used to store
> the data. In a lot of cases we should be able to convert the decimal type on
> the fly to the higher-precision type.
> {noformat}
> ERROR: File '/hdfs/path/000000_0_x_2' column 'alterd_decimal' has an invalid
> type length. Expecting: 11 len in file: 8
> {noformat}
> It would be convenient to allow reading parquet files where the
> precision/scale in the file can be converted to the precision/scale in the
> table metadata without loss of precision.
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