Zoltán Borók-Nagy created IMPALA-8498:
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Summary: Write column index for floating types when NaN is not
present
Key: IMPALA-8498
URL: https://issues.apache.org/jira/browse/IMPALA-8498
Project: IMPALA
Issue Type: Bug
Reporter: Zoltán Borók-Nagy
IMPALA-7304 disabled column index writing for floating point columns until
PARQUET-1222 is resolved.
PARQUET-1222 is responsible for defining a total order for floating values, but
the problematic values are only the NaNs. Therefore we can write the column
index if NaNs are not present in the data. Parquet-MR also does this, following
the principles in
[https://github.com/apache/parquet-format/blob/75eb7a7b84e6e62bfb09668b6d8d40b12597456e/src/main/thrift/parquet.thrift#L827-L834]
Impala should follow this behavior, and also when storing zeroes, it should
store -0.0 as minimum and +0.0 as maximum.
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