public static interface BuiltInMetadata.RowCount extends Metadata
Modifier and Type | Interface and Description |
---|---|
static interface |
BuiltInMetadata.RowCount.Handler
Handler API.
|
Modifier and Type | Field and Description |
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static MetadataDef<BuiltInMetadata.RowCount> |
DEF |
Modifier and Type | Method and Description |
---|---|
java.lang.Double |
getRowCount()
Estimates the number of rows which will be returned by a relational
expression.
|
static final MetadataDef<BuiltInMetadata.RowCount> DEF
java.lang.Double getRowCount()
RelNode.estimateRowCount(org.apache.calcite.rel.metadata.RelMetadataQuery)
, but metadata providers can override this
with their own cost models.Copyright © 2012–2019 The Apache Software Foundation. All rights reserved.