Package org.apache.calcite.sql

Class SqlUnknownLiteral

java.lang.Object

org.apache.calcite.sql.SqlNode

org.apache.calcite.sql.SqlLiteral

org.apache.calcite.sql.SqlUnknownLiteral

All Implemented Interfaces:

Cloneable

public class SqlUnknownLiteral
extends SqlLiteral

Literal whose type is not yet known.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.sql.SqlLiteral

SqlLiteral.SqlSymbol

Field Summary

Fields

Modifier and Type	Field	Description
final String	tag

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

value

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

EMPTY_ARRAY, pos

Method Summary

Modifier and Type	Method	Description
SqlLiteral	clone(SqlParserPos pos)	Clones a SqlNode with a different position.
String	getValue()	Returns the value of this literal.
SqlLiteral	resolve(SqlTypeName typeName)	Converts this unknown literal to a literal of known type.
void	unparse(SqlWriter writer, int leftPrec, int rightPrec)	Writes a SQL representation of this node to a writer.

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

accept, bigDecimalValue, booleanValue, createApproxNumeric, createBinaryString, createBinaryString, createBoolean, createCharString, createCharString, createDate, createDate, createExactNumeric, createInterval, createNegative, createNull, createSample, createSqlType, createSymbol, createTime, createTime, createTimestamp, createTimestamp, createTimestamp, createUnknown, createUnknown, equals, equalsDeep, getKind, getMonotonicity, getStringValue, getTypeName, getValueAs, hashCode, intValue, longValue, sampleValue, signum, stringValue, symbolValue, symbolValue_, toValue, unchain, unescapeUnicode, validate, value, valueMatchesType

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

clone, clone, cloneArray, equalDeep, equalDeep, equalsDeep, findValidOptions, getParserPosition, isA, toList, toList, toSqlString, toSqlString, toSqlString, toString, unparseWithParentheses, validateExpr

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

tag

public final String tag

Method Details

getValue

public String getValue()

Description copied from class: SqlLiteral

Returns the value of this literal.

Try not to use this method! There are so many different kinds of values, it's better to to let SqlLiteral do whatever it is you want to do.

Overrides:

getValue in class SqlLiteral

See Also:

• SqlLiteral.booleanValue()
• SqlLiteral.symbolValue(Class)

clone

public SqlLiteral clone(SqlParserPos pos)

Description copied from class: SqlNode

Clones a SqlNode with a different position.

Overrides:

clone in class SqlLiteral

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 SqlLiteral

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

resolve

public SqlLiteral resolve(SqlTypeName typeName)

Converts this unknown literal to a literal of known type.