org.apache.calcite.sql.dialect

Class Db2SqlDialect

java.lang.Object

org.apache.calcite.sql.SqlDialect

org.apache.calcite.sql.dialect.Db2SqlDialect

public class Db2SqlDialect
extends SqlDialect

A SqlDialect implementation for the IBM DB2 database.

Nested Class Summary

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

SqlDialect.CalendarPolicy, SqlDialect.Context, SqlDialect.DatabaseProduct, SqlDialect.FakeUtil

Field Summary

Fields

Modifier and Type	Field and Description
static SqlDialect	DEFAULT

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

CALCITE, DUMMY, EMPTY_CONTEXT, LOGGER, nullCollation

Constructor Summary

Constructors

Constructor and Description
Db2SqlDialect(SqlDialect.Context context) Creates a Db2SqlDialect.

Method Summary

Modifier and Type	Method and Description
boolean	hasImplicitTableAlias() Returns whether a qualified table in the FROM clause has an implicit alias which consists of just the table name.
boolean	supportsCharSet() Returns whether the dialect supports character set names as part of a data type, for instance VARCHAR(30) CHARACTER SET `ISO-8859-1`.

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

allowsAs, create, defaultNullDirection, emptyContext, emulateNullDirection, emulateNullDirectionWithIsNull, getCalendarPolicy, getCastSpec, getDatabaseProduct, getNullCollation, getProduct, identifierNeedsToBeQuoted, quoteIdentifier, quoteIdentifier, quoteIdentifier, quoteStringLiteral, quoteStringLiteralUnicode, quoteTimestampLiteral, requiresAliasForFromItems, rewriteSingleValueExpr, supportsAggregateFunction, supportsAliasedValues, supportsFunction, supportsNestedAggregations, supportsOffsetFetch, unparseCall, unparseDateTimeLiteral, unparseFetchUsingAnsi, unparseFetchUsingLimit, unparseOffsetFetch, unquoteStringLiteral

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT

public static final SqlDialect DEFAULT

Constructor Detail

Db2SqlDialect

public Db2SqlDialect(SqlDialect.Context context)

Creates a Db2SqlDialect.

Method Detail

supportsCharSet

public boolean supportsCharSet()

Description copied from class: SqlDialect

Returns whether the dialect supports character set names as part of a data type, for instance VARCHAR(30) CHARACTER SET `ISO-8859-1`.

Overrides:

supportsCharSet in class SqlDialect

hasImplicitTableAlias

public boolean hasImplicitTableAlias()

Description copied from class: SqlDialect

Returns whether a qualified table in the FROM clause has an implicit alias which consists of just the table name.

For example, in SqlDialect.DatabaseProduct.ORACLE

SELECT * FROM sales.emp

is equivalent to

SELECT * FROM sales.emp AS emp

and therefore

SELECT emp.empno FROM sales.emp

is valid. But SqlDialect.DatabaseProduct.DB2 does not have an implicit alias, so the previous query it not valid; you need to write

SELECT sales.emp.empno FROM sales.emp

Returns true for all databases except DB2.

Overrides:

hasImplicitTableAlias in class SqlDialect