org.eigenbase.sql
Class SqlSelect

java.lang.Object
  org.eigenbase.sql.SqlNode
      org.eigenbase.sql.SqlCall
          org.eigenbase.sql.SqlSelect

All Implemented Interfaces:

Cloneable

public class SqlSelect
extends SqlCall

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

Field Summary

static int	FROM_OPERAND
static int	GROUP_OPERAND
static int	HAVING_OPERAND
static int	KEYWORDS_OPERAND
static int	OPERAND_COUNT
static int	ORDER_OPERAND
static int	SELECT_OPERAND
static int	WHERE_OPERAND
static int	WINDOW_OPERAND

Fields inherited from class org.eigenbase.sql.SqlCall

operands

Fields inherited from class org.eigenbase.sql.SqlNode

emptyArray

Constructor Summary

SqlSelect(SqlSelectOperator operator, SqlNode[] operands, SqlParserPos pos)

Method Summary

void	addFrom(SqlIdentifier tableId)
void	addWhere(SqlNode condition)
SqlNode	getFrom()
SqlNodeList	getGroup()
SqlNode	getHaving()
SqlNode	getModifierNode(SqlSelectKeyword modifier)
SqlNodeList	getOrderList()
SqlNodeList	getSelectList()
SqlNode	getWhere()
SqlNodeList	getWindowList()
boolean	hasOrderBy()
boolean	hasWhere()
boolean	isDistinct()
boolean	isKeywordPresent(SqlSelectKeyword targetKeyWord)
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.eigenbase.sql.SqlCall

accept, clone, equalsDeep, findValidOptions, getCallSignature, getFunctionQuantifier, getKind, getMonotonicity, getOperands, getOperator, isA, isCountStar, isExpanded, isName, setOperand, setOperator

Methods inherited from class org.eigenbase.sql.SqlNode

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

Methods inherited from class java.lang.Object

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

Field Detail

KEYWORDS_OPERAND

public static final int KEYWORDS_OPERAND

See Also:

Constant Field Values

SELECT_OPERAND

public static final int SELECT_OPERAND

See Also:

Constant Field Values

FROM_OPERAND

public static final int FROM_OPERAND

See Also:

Constant Field Values

WHERE_OPERAND

public static final int WHERE_OPERAND

See Also:

Constant Field Values

GROUP_OPERAND

public static final int GROUP_OPERAND

See Also:

Constant Field Values

HAVING_OPERAND

public static final int HAVING_OPERAND

See Also:

Constant Field Values

WINDOW_OPERAND

public static final int WINDOW_OPERAND

See Also:

Constant Field Values

ORDER_OPERAND

public static final int ORDER_OPERAND

See Also:

Constant Field Values

OPERAND_COUNT

public static final int OPERAND_COUNT

See Also:

Constant Field Values

Constructor Detail

SqlSelect

SqlSelect(SqlSelectOperator operator,
          SqlNode[] operands,
          SqlParserPos pos)

Method Detail

isDistinct

public final boolean isDistinct()

getModifierNode

public final SqlNode getModifierNode(SqlSelectKeyword modifier)

getFrom

public final SqlNode getFrom()

getGroup

public final SqlNodeList getGroup()

getHaving

public final SqlNode getHaving()

getSelectList

public final SqlNodeList getSelectList()

getWhere

public final SqlNode getWhere()

getWindowList

public final SqlNodeList getWindowList()

getOrderList

public final SqlNodeList getOrderList()

addFrom

public void addFrom(SqlIdentifier tableId)

addWhere

public void addWhere(SqlNode condition)

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.eigenbase.sql.SqlCall, org.eigenbase.sql.validate.SqlValidator, org.eigenbase.sql.validate.SqlValidatorScope, org.eigenbase.sql.validate.SqlValidatorScope). Derived classes may override (as do, for example SqlSelect and SqlUpdate).

Overrides:

validate in class SqlCall

scope - Validator

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.eigenbase.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

hasOrderBy

public boolean hasOrderBy()

hasWhere

public boolean hasWhere()

isKeywordPresent

public boolean isKeywordPresent(SqlSelectKeyword targetKeyWord)