org.apache.calcite.sql.dialect

Class HiveSqlDialect

java.lang.Object

org.apache.calcite.sql.SqlDialect

org.apache.calcite.sql.dialect.HiveSqlDialect

public class HiveSqlDialect
extends SqlDialect

A SqlDialect implementation for the Apache Hive 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
private boolean	emulateNullDirection

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

CALCITE, DUMMY, EMPTY_CONTEXT, LOGGER, nullCollation

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
protected boolean	allowsAs()
SqlNode	emulateNullDirection(SqlNode node, boolean nullsFirst, boolean desc) Returns the SqlNode for emulating the null direction for the given field or null if no emulation needs to be done.
void	unparseOffsetFetch(SqlWriter writer, SqlNode offset, SqlNode fetch) Converts an offset and fetch into SQL.

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

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

emulateNullDirection

private final boolean emulateNullDirection

Constructor Detail

HiveSqlDialect

public HiveSqlDialect(SqlDialect.Context context)

Creates a HiveSqlDialect.

Method Detail

allowsAs

protected boolean allowsAs()

Overrides:

allowsAs in class SqlDialect

unparseOffsetFetch

public void unparseOffsetFetch(SqlWriter writer,
                               SqlNode offset,
                               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)

emulateNullDirection

public SqlNode emulateNullDirection(SqlNode node,
                                    boolean nullsFirst,
                                    boolean desc)

Description copied from class: SqlDialect

Returns the SqlNode for emulating the null direction for the given field or null if no emulation needs to be done.

Overrides:

emulateNullDirection in class SqlDialect

Parameters:

node - The SqlNode representing the expression

nullsFirst - Whether nulls should come first

desc - Whether the sort direction is RelFieldCollation.Direction.DESCENDING or RelFieldCollation.Direction.STRICTLY_DESCENDING

Returns:

A SqlNode for null direction emulation or null if not required