public static interface FlinkMetadata.ColumnNullCount
extends org.apache.calcite.rel.metadata.Metadata
Modifier and Type | Interface and Description |
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static interface |
FlinkMetadata.ColumnNullCount.Handler
Handler API.
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Modifier and Type | Field and Description |
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static org.apache.calcite.rel.metadata.MetadataDef<FlinkMetadata.ColumnNullCount> |
DEF |
static Method |
METHOD |
Modifier and Type | Method and Description |
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Double |
getColumnNullCount(int index)
Returns the null count of the given column from a specified relational expression.
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static final Method METHOD
static final org.apache.calcite.rel.metadata.MetadataDef<FlinkMetadata.ColumnNullCount> DEF
Double getColumnNullCount(int index)
index
- the index of the given column in a specified relational expressionCopyright © 2014–2020 The Apache Software Foundation. All rights reserved.