[jira] [Created] (SPARK-11007) Add dictionary support for CatalystDecimalConverter

["Cheng Lian (JIRA)" <ji...@apache.org>]

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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