org.apache.calcite.sql.dialect

Class HsqldbSqlDialect

java.lang.Object

org.apache.calcite.sql.SqlDialect

org.apache.calcite.sql.dialect.HsqldbSqlDialect

public class HsqldbSqlDialect
extends SqlDialect

A SqlDialect implementation for the Hsqldb 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
static SqlDialect.Context	DEFAULT_CONTEXT

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

BUILT_IN_OPERATORS_LIST, EMPTY_CONTEXT, identifierEndQuoteString, identifierEscapedQuote, identifierQuoteString, literalEndQuoteString, literalEscapedQuote, literalQuoteString, LOGGER, nullCollation

Constructor Summary

Constructors

Constructor and Description
HsqldbSqlDialect(SqlDialect.Context context) Creates an HsqldbSqlDialect.

Method Summary

Modifier and Type	Method and Description
SqlNode	rewriteSingleValueExpr(SqlNode aggCall) Rewrite SINGLE_VALUE into expression based on database variants E.g.
boolean	supportsAggregateFunctionFilter() Returns whether this dialect supports the use of FILTER clauses for aggregate functions.
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`.
boolean	supportsWindowFunctions() Returns whether this dialect supports window functions (OVER clause).
void	unparseCall(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec)
void	unparseOffsetFetch(SqlWriter writer, @Nullable SqlNode offset, @Nullable SqlNode fetch) Converts an offset and fetch into SQL.

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

allowsAs, configureParser, configureParser, containsNonAscii, create, defaultNullDirection, emulateJoinTypeForCrossJoin, emulateNullDirection, emulateNullDirectionWithIsNull, getCalendarPolicy, getCastSpec, getConformance, getDatabaseProduct, getNullCollation, getProduct, getQuotedCasing, getQuoting, getSingleRowTableName, getTypeSystem, getUnquotedCasing, hasImplicitTableAlias, identifierNeedsQuote, isCaseSensitive, quoteIdentifier, quoteIdentifier, quoteIdentifier, quoteStringLiteral, quoteStringLiteral, quoteStringLiteralUnicode, quoteTimestampLiteral, requiresAliasForFromItems, supportsAggregateFunction, supportsAliasedValues, supportsApproxCountDistinct, supportsDataType, supportsFunction, supportsGroupByLiteral, supportsGroupByWithCube, supportsGroupByWithRollup, supportsImplicitTypeCoercion, supportsJoinType, supportsNestedAggregations, supportsOffsetFetch, unparseDateTimeLiteral, unparseFetchUsingAnsi, unparseFetchUsingLimit, unparseLimit, unparseOffset, unparseSqlDatetimeArithmetic, unparseSqlIntervalLiteral, unparseSqlIntervalQualifier, unparseTableScanHints, unparseTopN, unquoteStringLiteral

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_CONTEXT

public static final SqlDialect.Context DEFAULT_CONTEXT

DEFAULT

public static final SqlDialect DEFAULT

Constructor Detail

HsqldbSqlDialect

public HsqldbSqlDialect(SqlDialect.Context context)

Creates an HsqldbSqlDialect.

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

supportsAggregateFunctionFilter

public boolean supportsAggregateFunctionFilter()

Description copied from class: SqlDialect

Returns whether this dialect supports the use of FILTER clauses for aggregate functions. e.g. COUNT(*) FILTER (WHERE a = 2).

Overrides:

supportsAggregateFunctionFilter in class SqlDialect

supportsWindowFunctions

public boolean supportsWindowFunctions()

Description copied from class: SqlDialect

Returns whether this dialect supports window functions (OVER clause).

Overrides:

supportsWindowFunctions in class SqlDialect

unparseCall

public void unparseCall(SqlWriter writer,
                        SqlCall call,
                        int leftPrec,
                        int rightPrec)

Overrides:

unparseCall in class SqlDialect

unparseOffsetFetch

public void unparseOffsetFetch(SqlWriter writer,
                               @Nullable SqlNode offset,
                               @Nullable SqlNode fetch)

Description copied from class: SqlDialect

Converts an offset and fetch into SQL.

At least one of offset and fetch must be provided.

Common options:

• OFFSET offset ROWS FETCH NEXT fetch ROWS ONLY (ANSI standard SQL, Oracle, PostgreSQL, and the default)
• LIMIT fetch OFFSET offset (Apache Hive, MySQL, Redshift)

Overrides:

unparseOffsetFetch in class SqlDialect

Parameters:

writer - Writer

offset - Number of rows to skip before emitting, or null

fetch - Number of rows to fetch, or null

See Also:

SqlDialect.unparseFetchUsingAnsi(SqlWriter, SqlNode, SqlNode), SqlDialect.unparseFetchUsingLimit(SqlWriter, SqlNode, SqlNode)

rewriteSingleValueExpr

public SqlNode rewriteSingleValueExpr(SqlNode aggCall)

Description copied from class: SqlDialect

Rewrite SINGLE_VALUE into expression based on database variants E.g. HSQLDB, MYSQL, ORACLE, etc

Overrides:

rewriteSingleValueExpr in class SqlDialect