Cheng Lian created HIVE-12069:
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Summary: Hive cannot read Parquet decimals backed by INT32 or INT64
Key: HIVE-12069
URL: https://issues.apache.org/jira/browse/HIVE-12069
Project: Hive
Issue Type: Sub-task
Affects Versions: 1.2.1
Reporter: Cheng Lian
According to the [DECIMAL
section|https://github.com/apache/parquet-format/blob/5b806d1e855bf47f5234c768aefc000b704f43ab/LogicalTypes.md#decimal]
of parquet-format spec, low precision Parquet decimals can be written as
{{INT32}} or {{INT64}} for better storage and query efficiency. However,
currently Hive only recognizes decimals backed by binaries (either {{BINARY}}
or {{FIXED_LEN_BYTE_ARRAY}}).
We can improve this by providing a more general {{PrimitiveConverter}}
[here|https://github.com/apache/hive/blob/release-1.2.1/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/convert/ETypeConverter.java#L127-L137].
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