org.apache.calcite.sql

Class SqlAlter

java.lang.Object

org.apache.calcite.sql.SqlNode

org.apache.calcite.sql.SqlCall

org.apache.calcite.sql.SqlAlter

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

SqlSetOption

public abstract class SqlAlter
extends SqlCall

Base class for an ALTER statements parse tree nodes. The portion of the statement covered by this class is "ALTER <SCOPE>. Subclasses handle whatever comes after the scope.

Field Summary

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

EMPTY_ARRAY, pos

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SqlAlter(SqlParserPos pos)
protected	SqlAlter(SqlParserPos pos, @Nullable String scope)

Method Summary

Modifier and Type	Method and Description
@Nullable String	getScope()
void	setScope(@Nullable String scope)
void	unparse(SqlWriter writer, int leftPrec, int rightPrec) Writes a SQL representation of this node to a writer.
protected abstract void	unparseAlterOperation(SqlWriter writer, int leftPrec, int rightPrec)

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

accept, clone, equalsDeep, findValidOptions, getCallSignature, getFunctionQuantifier, getKind, getMonotonicity, getOperandList, getOperator, isCountStar, isExpanded, operand, operandCount, setOperand, 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

SqlAlter

protected SqlAlter(SqlParserPos pos)

SqlAlter

protected SqlAlter(SqlParserPos pos,
                   @Nullable String scope)

Method Detail

unparse

public final 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

unparseAlterOperation

protected abstract void unparseAlterOperation(SqlWriter writer,
                                              int leftPrec,
                                              int rightPrec)

getScope

public @Nullable String getScope()

setScope

public void setScope(@Nullable String scope)