public class IsNull extends UnaryExpression implements scala.Product, scala.Serializable
Constructor and Description |
---|
IsNull(Expression child) |
Modifier and Type | Method and Description |
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Expression |
child() |
BasicTypeInfo<Boolean> |
resultType()
Returns the
TypeInformation for evaluating this expression. |
org.apache.calcite.rex.RexNode |
toRexNode(org.apache.calcite.tools.RelBuilder relBuilder)
Convert Expression to its counterpart in Calcite, i.e.
|
String |
toString() |
children
checkEquals, childrenValid, valid, validateInput
fastEquals, makeCopy, postOrderTransform, preOrderVisit
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
public IsNull(Expression child)
public Expression child()
child
in class UnaryExpression
public org.apache.calcite.rex.RexNode toRexNode(org.apache.calcite.tools.RelBuilder relBuilder)
Expression
toRexNode
in class Expression
public BasicTypeInfo<Boolean> resultType()
Expression
TypeInformation
for evaluating this expression.
It is sometimes not available until the expression is valid.resultType
in class Expression
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