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, @Nullable SqlNode value, SqlNodeList whenList, SqlNodeList thenList, @Nullable SqlNode elseExpr) Creates a SqlCase expression.

Method Summary

Modifier and Type	Method and Description
static SqlCase	createSwitched(SqlParserPos pos, @Nullable SqlNode value, SqlNodeList whenList, SqlNodeList thenList, @Nullable SqlNode elseClause) Creates a call to the switched form of the CASE operator.
@Nullable SqlNode	getElseOperand()
SqlKind	getKind() Returns the type of node this is, or SqlKind.OTHER if it's nothing special.
List<SqlNode>	getOperandList() Returns the list of operands.
SqlOperator	getOperator()
SqlNodeList	getThenOperands()
@Nullable SqlNode	getValueOperand()
SqlNodeList	getWhenOperands()
void	setOperand(int i, @Nullable 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, clone, cloneArray, equalDeep, equalDeep, equalsDeep, getParserPosition, isA, toList, toList, toSqlString, toSqlString, toSqlString, toString, unparseWithParentheses, validateExpr

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlCase

public SqlCase(SqlParserPos pos,
               @Nullable SqlNode value,
               SqlNodeList whenList,
               SqlNodeList thenList,
               @Nullable 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,
                                     @Nullable SqlNode value,
                                     SqlNodeList whenList,
                                     SqlNodeList thenList,
                                     @Nullable SqlNode elseClause)

Creates a call to the switched form of the CASE operator. For example:

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 SqlCall

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()

Description copied from class: SqlCall

Returns the list of operands. The set and order of operands is call-specific.

Note: the proper type would be List<@Nullable SqlNode>, however, it would trigger too many changes to the current codebase.

Specified by:

getOperandList in class SqlCall

Returns:

the list of call operands, never null, the operands can be null

setOperand

public void setOperand(int i,
                       @Nullable 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 @Nullable SqlNode getValueOperand()

getWhenOperands

public SqlNodeList getWhenOperands()

getThenOperands

public SqlNodeList getThenOperands()

getElseOperand

public @Nullable SqlNode getElseOperand()