Cheng Lian created SPARK-11007:
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Summary: Add dictionary support for CatalystDecimalConverter
Key: SPARK-11007
URL: https://issues.apache.org/jira/browse/SPARK-11007
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.5.1, 1.5.0, 1.4.1, 1.4.0
Reporter: Cheng Lian
Assignee: Cheng Lian
Currently {{CatalystDecimalConverter}} doesn't explicitly support dictionary
encoding. The consequence is that, the underlying Parquet {{ColumnReader}}
always sends raw {{Int}}/{{Long}}/{{Binary}} values decoded from the dictionary
to {{CatalystDecimalConverter}} even if the column is encoded using a
dictionary. By adding explicit dictionary support (similar to what
{{CatalystStringConverter}} does), we can avoid constructing decimals
repeatedly. This should be especially effective for binary backed decimals.
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