Package org.yamcs.yarch.streamsql

Class NullExpression

java.lang.Object

org.yamcs.yarch.streamsql.Expression

org.yamcs.yarch.streamsql.NullExpression

public class NullExpression
extends Expression

This represents a NULL value coming from some sql expression for example: select null from x

Field Summary

Fields inherited from class org.yamcs.yarch.streamsql.Expression

children, constantValue, hasAggregates, inputDef, type

Method Summary

Modifier and Type	Method	Description
void	doBind()
void	fillCode_getValueReturn(StringBuilder code)

Methods inherited from class org.yamcs.yarch.streamsql.Expression

addFilter, bind, collectAggregates, collectRequiredInputs, compile, fillCode_Constructor, fillCode_Declarations, fillCode_getValueBody, fillCode_InputDefVars, getColumnName, getConstantValue, getType, isAggregate, isConstant, setArgs, setColumnName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

doBind

public void doBind()
            throws StreamSqlException

Specified by:

doBind in class Expression

Throws:

StreamSqlException

fillCode_getValueReturn

public void fillCode_getValueReturn(StringBuilder code)
                             throws StreamSqlException

Specified by:

fillCode_getValueReturn in class Expression

Throws:

StreamSqlException