Package org.apache.calcite.sql.dialect

Class JethroDataSqlDialect

java.lang.Object

org.apache.calcite.sql.SqlDialect

org.apache.calcite.sql.dialect.JethroDataSqlDialect

public class JethroDataSqlDialect
extends SqlDialect

A SqlDialect implementation for the JethroData database.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	JethroDataSqlDialect.JethroInfo	Information about the capabilities of a Jethro database.
static interface	JethroDataSqlDialect.JethroInfoCache	Stores information about capabilities of Jethro databases.
private static class	JethroDataSqlDialect.JethroInfoCacheImpl	Implementation of JethroInfoCache.
(package private) static class	JethroDataSqlDialect.JethroSupportedFunction	Information about a function supported by Jethro.

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	Description
private JethroDataSqlDialect.JethroInfo	info

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

BUILT_IN_OPERATORS_LIST, CALCITE, DUMMY, EMPTY_CONTEXT, LOGGER, nullCollation

Constructor Summary

Constructors

Constructor	Description
JethroDataSqlDialect(SqlDialect.Context context)	Creates a JethroDataSqlDialect.

Method Summary

Modifier and Type	Method	Description
static JethroDataSqlDialect.JethroInfoCache	createCache()
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.
boolean	supportsAggregateFunction(SqlKind kind)
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	supportsFunction(SqlOperator operator, RelDataType type, java.util.List<RelDataType> paramTypes)	Returns whether this dialect supports a given function or operator.
boolean	supportsNestedAggregations()	Returns whether the dialect supports nested aggregations, for instance SELECT SUM(SUM(1)) .
boolean	supportsOffsetFetch()	Returns whether the dialect supports OFFSET/FETCH clauses introduced by SQL:2008, for instance OFFSET 10 ROWS FETCH NEXT 20 ROWS ONLY.

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

allowsAs, create, defaultNullDirection, emptyContext, emulateNullDirectionWithIsNull, getCalendarPolicy, getCastSpec, getDatabaseProduct, getNullCollation, getProduct, getTypeSystem, hasImplicitTableAlias, identifierNeedsToBeQuoted, quoteIdentifier, quoteIdentifier, quoteIdentifier, quoteStringLiteral, quoteStringLiteralUnicode, quoteTimestampLiteral, requiresAliasForFromItems, rewriteSingleValueExpr, supportsAliasedValues, supportsWindowFunctions, unparseCall, unparseDateTimeLiteral, unparseFetchUsingAnsi, unparseFetchUsingLimit, unparseOffsetFetch, unparseSqlDatetimeArithmetic, unparseSqlIntervalLiteral, unparseSqlIntervalQualifier, unquoteStringLiteral

Methods inherited from class java.lang.Object

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

Field Detail

info

private final JethroDataSqlDialect.JethroInfo info

Constructor Detail

JethroDataSqlDialect

public JethroDataSqlDialect(SqlDialect.Context context)

Creates a JethroDataSqlDialect.

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

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

supportsAggregateFunction

public boolean supportsAggregateFunction(SqlKind kind)

Overrides:

supportsAggregateFunction in class SqlDialect

supportsFunction

public boolean supportsFunction(SqlOperator operator,
                                RelDataType type,
                                java.util.List<RelDataType> paramTypes)

Description copied from class: SqlDialect

Returns whether this dialect supports a given function or operator. It only applies to built-in scalar functions and operators, since user-defined functions and procedures should be read by JdbcSchema.

Overrides:

supportsFunction in class SqlDialect

supportsOffsetFetch

public boolean supportsOffsetFetch()

Description copied from class: SqlDialect

Returns whether the dialect supports OFFSET/FETCH clauses introduced by SQL:2008, for instance OFFSET 10 ROWS FETCH NEXT 20 ROWS ONLY. If false, we assume that the dialect supports the alternative syntax LIMIT 20 OFFSET 10.

Overrides:

supportsOffsetFetch in class SqlDialect

supportsNestedAggregations

public boolean supportsNestedAggregations()

Description copied from class: SqlDialect

Returns whether the dialect supports nested aggregations, for instance SELECT SUM(SUM(1)) .

Overrides:

supportsNestedAggregations in class SqlDialect

createCache

public static JethroDataSqlDialect.JethroInfoCache createCache()