trait SupportsPushDownTopN extends ScanBuilder
A mix-in interface for ScanBuilder. Data sources can implement this interface to
push down top N(query with ORDER BY ... LIMIT n). We can push down top N with many other
operations if they follow the operator order we defined in ScanBuilder's class doc.
- Annotations
- @Evolving()
- Source
- SupportsPushDownTopN.java
- Since
3.3.0
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- SupportsPushDownTopN
- ScanBuilder
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Abstract Value Members
- abstract def build(): Scan
- Definition Classes
- ScanBuilder
- abstract def pushTopN(orders: Array[SortOrder], limit: Int): Boolean
Pushes down top N to the data source.
Concrete Value Members
- final def !=(arg0: Any): Boolean
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- final def ##: Int
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- def isPartiallyPushed(): Boolean
Whether the top N is partially pushed or not.
Whether the top N is partially pushed or not. If it returns true, then Spark will do top N again. This method will only be called when
#pushTopNreturns true. - final def ne(arg0: AnyRef): Boolean
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- @throws(classOf[java.lang.Throwable]) @Deprecated
- Deprecated
(Since version 9)