Liang-Chi Hsieh created SPARK-6607:
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Summary: Aggregation attribute name including special chars '('
and ')' should be replaced before generating Parquet schema
Key: SPARK-6607
URL: https://issues.apache.org/jira/browse/SPARK-6607
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Liang-Chi Hsieh
'(' and ')' are special characters used in Parquet schema for type annotation.
When we run an aggregation query, we will obtain attribute name such as
"MAX(a)".
If we directly store the generated DataFrame as Parquet file, it causes failure
when reading and parsing the stored schema string.
Several methods can be adopted to solve this. This pr uses a simplest one to
just replace attribute names before generating Parquet schema based on these
attributes.
Another possible method might be modifying all aggregation expression names
from "func(column)" to "func[column]".
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