org.apache.flink.table.expressions

Class SqlCallExpression

java.lang.Object

org.apache.flink.table.expressions.SqlCallExpression

All Implemented Interfaces:

Expression

@PublicEvolving
public final class SqlCallExpression
extends Object
implements Expression

A call to a SQL expression.

The given string is parsed and translated into an Expression during planning. Only the translated expression is evaluated during runtime.

Note: Actually, this class belongs into the flink-table-api-java module, however, since this expression is crucial for catalogs when defining persistable computed columns and watermark strategies, we keep it in flink-table-common to keep the dependencies of catalogs low.

Constructor Summary

Constructors

Constructor and Description
SqlCallExpression(String sqlExpression)

Method Summary

Modifier and Type	Method and Description
<R> R	accept(ExpressionVisitor<R> visitor)
String	asSummaryString() Returns a string that summarizes this expression for printing to a console.
boolean	equals(Object o)
List<Expression>	getChildren()
String	getSqlExpression()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SqlCallExpression

public SqlCallExpression(String sqlExpression)

Method Detail

getSqlExpression

public String getSqlExpression()

asSummaryString

public String asSummaryString()

Description copied from interface: Expression

Returns a string that summarizes this expression for printing to a console. An implementation might skip very specific properties.

Specified by:

asSummaryString in interface Expression

Returns:

summary string of this expression for debugging purposes

getChildren

public List<Expression> getChildren()

Specified by:

getChildren in interface Expression

accept

public <R> R accept(ExpressionVisitor<R> visitor)

Specified by:

accept in interface Expression

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object