Cheng Lian created SPARK-11153:
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Summary: Turns off Parquet filter push-down for string and binary
columns
Key: SPARK-11153
URL: https://issues.apache.org/jira/browse/SPARK-11153
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.5.1, 1.5.0
Reporter: Cheng Lian
Assignee: Cheng Lian
Priority: Critical
Due to PARQUET-251, {{BINARY}} columns in existing Parquet files may be written
with corrupted statistics information. This information is used by filter
push-down optimization. Since Spark 1.5 turns on Parquet filter push-down by
default, we may end up with wrong query results. PARQUET-251 has been fixed in
parquet-mr 1.8.1, but Spark 1.5 is still using 1.7.0.
This affects all Spark SQL data types that can be mapped to Parquet {{BINARY}},
namely:
- {{StringType}}
- {{BinaryType}}
- {{DecimalType}} (but Spark SQL doesn't support pushing down {{DecimalType}}
columns for now.)
To avoid wrong query results, we should disable filter push-down for columns of
{{StringType}} and {{BinaryType}} until we upgrade to parquet-mr 1.8.
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