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https://issues.apache.org/jira/browse/IMPALA-7087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17384976#comment-17384976
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ASF subversion and git services commented on IMPALA-7087:
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Commit b0d364cc5a62fcfb7ad26d52d3f492239151a3c1 in impala's branch
refs/heads/master from stiga-huang
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=b0d364c ]
IMPALA-10808: Fix crash on illegal decimal precision in parquet file schema
In IMPALA-7087, we allow parquet file schema to have decimal precision
lower than the one in table schema. However, we should check illegal
precisions like 0 or negative values. They will hit a DCHECK in
ColumnType::GetDecimalByteSize(int).
Change-Id: If84fe14740aea97461ebccedffa4c2ca393333d8
Reviewed-on: http://gerrit.cloudera.org:8080/17701
Reviewed-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
> 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: Zoltán Borók-Nagy
> Priority: Major
> Labels: decimal, parquet, ramp-up
> Fix For: Impala 4.1
>
> Attachments: binary_decimal_precision_and_scale_widening.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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