Cheng Lian created SPARK-8887:
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Summary: Explicitly define which data types can be used as dynamic
partition columns
Key: SPARK-8887
URL: https://issues.apache.org/jira/browse/SPARK-8887
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 1.4.0
Reporter: Cheng Lian
{{InsertIntoHadoopFsRelation}} implements Hive compatible dynamic partitioning
insertion, which uses {{String.valueOf}} to write encode partition column
values into dynamic partition directories. This actually limits the data types
that can be used in partition column. For example, string representation of
{{StructType}} values is not well defined. However, this limitation is not
explicitly enforced.
There are several things we can improve:
# Enforce dynamic column data type requirements by adding analysis rules and
throws {{AnalysisException}} when violation occurs.
# Abstract away string representation of various data types, so that we don't
need to convert internal representation types (e.g. {{UTF8String}}) to external
types (e.g. {{String}}). A set of Hive compatible implementations should be
provided to ensure compatibility with Hive.
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