godfreyhe commented on a change in pull request #15641:
URL: https://github.com/apache/flink/pull/15641#discussion_r614721488
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File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/metadata/FlinkRelMdFilteredColumnInterval.scala
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@@ -67,14 +67,51 @@ class FlinkRelMdFilteredColumnInterval private extends
MetadataHandler[FilteredC
} else {
val condition = project.getProjects.get(filterArg)
checkArgument(SqlTypeUtil.inBooleanFamily(condition.getType))
- ColumnIntervalUtil.getColumnIntervalWithFilter(
+ intersectColumnIntervalWithPredicate(
+ project.getProjects.get(columnIndex),
Option(columnInterval),
condition,
- columnIndex,
project.getCluster.getRexBuilder)
}
}
+ /**
+ * Calculate the value interval of the given column (which may carry derived
column interval) and
+ * additional predicate expression, if the given column is a RexInputRef
then the final interval
+ * is intersect with the predicate, if the given column is a RexLiteral then
the final interval
+ * is the literal itself, otherwise return null.
+ * This can be improved (e.g., for RexCall) later and refactor this meta
data to a utility class
Review comment:
move `refactor this meta data to a utility class because it only serves
for calculating the monotonicity of some specific aggregate functions.` to
class javadoc ?
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