Zhenhua Wang created SPARK-20318:
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Summary: Use Catalyst type for min/max in ColumnStat for ease of
estimation
Key: SPARK-20318
URL: https://issues.apache.org/jira/browse/SPARK-20318
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 2.2.0
Reporter: Zhenhua Wang
Currently when estimating predicates like col > literal or col = literal, we
will update min or max in column stats based on literal value. However, literal
value is of Catalyst type (internal type), while min/max is of external type.
This causes unnecessary conversion when comparing them and updating column
stats.
To solve this, we can use Catalyst type for min/max in ColumnStat for ease of
estimation. Note that the persistent form in metastore is still of external
type, so there's no inconsistency for statistics in metastore.
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