org.apache.calcite.sql.fun

Class SqlCase

java.lang.Object

org.apache.calcite.sql.SqlNode

org.apache.calcite.sql.SqlCall

org.apache.calcite.sql.fun.SqlCase

All Implemented Interfaces:

Cloneable

public class SqlCase
extends SqlCall

A SqlCase is a node of a parse tree which represents a case statement. It warrants its own node type just because we have a lot of methods to put somewhere.

Field Summary

Fields inherited from class org.apache.calcite.sql.SqlNode

EMPTY_ARRAY, pos

Constructor Summary

Constructors

Constructor and Description
SqlCase(SqlParserPos pos, SqlNode value, SqlNodeList whenList, SqlNodeList thenList, SqlNode elseExpr) Creates a SqlCase expression.

Method Summary

Methods

Modifier and Type	Method and Description
static SqlCase	createSwitched(SqlParserPos pos, SqlNode value, SqlNodeList whenList, SqlNodeList thenList, SqlNode elseClause) Creates a call to the switched form of the case operator, viz: CASE value WHEN whenList[0] THEN thenList[0] WHEN whenList[1] THEN thenList[1] ... ELSE elseClause END
SqlNode	getElseOperand()
SqlKind	getKind() Returns the type of node this is, or SqlKind.OTHER if it's nothing special.
List<SqlNode>	getOperandList()
SqlOperator	getOperator()
SqlNodeList	getThenOperands()
SqlNode	getValueOperand()
SqlNodeList	getWhenOperands()
void	setOperand(int i, SqlNode operand) Changes the value of an operand.

Methods inherited from class org.apache.calcite.sql.SqlCall

accept, clone, equalsDeep, findValidOptions, getCallSignature, getFunctionQuantifier, getMonotonicity, isCountStar, isExpanded, operand, operandCount, unparse, validate

Methods inherited from class org.apache.calcite.sql.SqlNode

clone, cloneArray, equalDeep, equalDeep, getParserPosition, isA, toSqlString, toSqlString, toString, validateExpr

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlCase

public SqlCase(SqlParserPos pos,
       SqlNode value,
       SqlNodeList whenList,
       SqlNodeList thenList,
       SqlNode elseExpr)

Creates a SqlCase expression.

Parameters:

pos - Parser position

value - The value (null for boolean case)

whenList - List of all WHEN expressions

thenList - List of all THEN expressions

elseExpr - The implicit or explicit ELSE expression

Method Detail

createSwitched

public static SqlCase createSwitched(SqlParserPos pos,
                     SqlNode value,
                     SqlNodeList whenList,
                     SqlNodeList thenList,
                     SqlNode elseClause)

Creates a call to the switched form of the case operator, viz:

CASE value
WHEN whenList[0] THEN thenList[0]
WHEN whenList[1] THEN thenList[1]
...
ELSE elseClause
END

getKind

public SqlKind getKind()

Description copied from class: SqlNode

Returns the type of node this is, or SqlKind.OTHER if it's nothing special.

Overrides:

getKind in class SqlNode

Returns:

a SqlKind value, never null

See Also:

SqlNode.isA(java.util.Set<org.apache.calcite.sql.SqlKind>)

getOperator

public SqlOperator getOperator()

Specified by:

getOperator in class SqlCall

getOperandList

public List<SqlNode> getOperandList()

Specified by:

getOperandList in class SqlCall

setOperand

public void setOperand(int i,
              SqlNode operand)

Description copied from class: SqlCall

Changes the value of an operand. Allows some rewrite by SqlValidator; use sparingly.

Overrides:

setOperand in class SqlCall

Parameters:

i - Operand index

operand - Operand value

getValueOperand

public SqlNode getValueOperand()

getWhenOperands

public SqlNodeList getWhenOperands()

getThenOperands

public SqlNodeList getThenOperands()

getElseOperand

public SqlNode getElseOperand()