Package org.apache.calcite.sql

Class SqlUpdate

java.lang.Object

org.apache.calcite.sql.SqlNode

org.apache.calcite.sql.SqlCall

org.apache.calcite.sql.SqlUpdate

All Implemented Interfaces:

Cloneable

public class SqlUpdate
extends SqlCall

A SqlUpdate is a node of a parse tree which represents an UPDATE statement.

Field Summary

Fields

Modifier and Type	Field	Description
static final SqlSpecialOperator	OPERATOR

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

EMPTY_ARRAY, pos

Constructor Summary

Constructors

Constructor	Description
SqlUpdate(SqlParserPos pos, SqlNode targetTable, SqlNodeList targetColumnList, SqlNodeList sourceExpressionList, @Nullable SqlNode condition, @Nullable SqlSelect sourceSelect, @Nullable SqlIdentifier alias)

Method Summary

Modifier and Type	Method	Description
@Nullable SqlIdentifier	getAlias()	Returns the alias for the target table of this UPDATE.
@Nullable SqlNode	getCondition()	Gets the filter condition for rows to be updated.
SqlKind	getKind()	Returns the type of node this is, or SqlKind.OTHER if it's nothing special.
List<@Nullable SqlNode>	getOperandList()	Returns the list of operands.
SqlOperator	getOperator()
SqlNodeList	getSourceExpressionList()	Returns the list of source expressions.
@Nullable SqlSelect	getSourceSelect()	Gets the source SELECT expression for the data to be updated.
SqlNodeList	getTargetColumnList()	Returns the list of target column names.
SqlNode	getTargetTable()	Returns the identifier for the target table of this UPDATE.
void	setAlias(SqlIdentifier alias)
void	setOperand(int i, @Nullable SqlNode operand)	Changes the value of an operand.
void	setSourceSelect(SqlSelect sourceSelect)
void	unparse(SqlWriter writer, int leftPrec, int rightPrec)	Writes a SQL representation of this node to a writer.
void	validate(SqlValidator validator, SqlValidatorScope scope)	Validates this call.

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

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

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

Field Details

OPERATOR

public static final SqlSpecialOperator OPERATOR

Constructor Details

SqlUpdate

public SqlUpdate(SqlParserPos pos,
 SqlNode targetTable,
 SqlNodeList targetColumnList,
 SqlNodeList sourceExpressionList,
 @Nullable SqlNode condition,
 @Nullable SqlSelect sourceSelect,
 @Nullable SqlIdentifier alias)

Method Details

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<@Nullable 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

getTargetTable

public SqlNode getTargetTable()

Returns the identifier for the target table of this UPDATE.

getAlias

@Pure
public @Nullable SqlIdentifier getAlias()

Returns the alias for the target table of this UPDATE.

setAlias

public void setAlias(SqlIdentifier alias)

getTargetColumnList

public SqlNodeList getTargetColumnList()

Returns the list of target column names.

getSourceExpressionList

public SqlNodeList getSourceExpressionList()

Returns the list of source expressions.

getCondition

public @Nullable SqlNode getCondition()

Gets the filter condition for rows to be updated.

Returns:

the condition expression for the data to be updated, or null for all rows in the table

getSourceSelect

public @Nullable SqlSelect getSourceSelect()

Gets the source SELECT expression for the data to be updated. Returns null before the statement has been expanded by SqlValidatorImpl.performUnconditionalRewrites(SqlNode, boolean).

Returns:

the source SELECT for the data to be updated

setSourceSelect

public void setSourceSelect(SqlSelect sourceSelect)

unparse

public void unparse(SqlWriter writer,
 int leftPrec,
 int rightPrec)

Description copied from class: SqlNode

Writes a SQL representation of this node to a writer.

The leftPrec and rightPrec parameters give us enough context to decide whether we need to enclose the expression in parentheses. For example, we need parentheses around "2 + 3" if preceded by "5 *". This is because the precedence of the "*" operator is greater than the precedence of the "+" operator.

The algorithm handles left- and right-associative operators by giving them slightly different left- and right-precedence.

If SqlWriter.isAlwaysUseParentheses() is true, we use parentheses even when they are not required by the precedence rules.

For the details of this algorithm, see SqlCall.unparse(org.apache.calcite.sql.SqlWriter, int, int).

Overrides:

unparse in class SqlCall

Parameters:

writer - Target writer

leftPrec - The precedence of the SqlNode immediately preceding this node in a depth-first scan of the parse tree

rightPrec - The precedence of the SqlNode immediately

validate

public void validate(SqlValidator validator,
 SqlValidatorScope scope)

Description copied from class: SqlCall

Validates this call.

The default implementation delegates the validation to the operator's SqlOperator.validateCall(org.apache.calcite.sql.SqlCall, org.apache.calcite.sql.validate.SqlValidator, org.apache.calcite.sql.validate.SqlValidatorScope, org.apache.calcite.sql.validate.SqlValidatorScope). Derived classes may override (as do, for example SqlSelect and SqlUpdate).

Overrides:

validate in class SqlCall

Parameters:

scope - Validator