mondrian.spi.impl

Class GoogleBigQueryDialect

java.lang.Object

mondrian.spi.impl.JdbcDialectImpl

mondrian.spi.impl.GoogleBigQueryDialect

All Implemented Interfaces:

Dialect

public class GoogleBigQueryDialect
extends JdbcDialectImpl

This is the Mondrian dialect for Google BigQuery. It was tested against google-api-services-bigquery-v2-rev355-1.22.0 in Q1 2018.

Author:

lucboudreau

Nested Class Summary

Nested classes/interfaces inherited from interface mondrian.spi.Dialect

Dialect.DatabaseProduct, Dialect.Datatype

Field Summary

Fields

Modifier and Type	Field and Description
static JdbcDialectFactory	FACTORY

Fields inherited from class mondrian.spi.impl.JdbcDialectImpl

databaseProduct, permitsSelectNotInGroupBy, productVersion

Constructor Summary

Constructors

Constructor and Description
GoogleBigQueryDialect(Connection connection)

Method Summary

Modifier and Type	Method and Description
boolean	allowsAs() Returns whether the SQL dialect allows "AS" in the FROM clause.
boolean	allowsDdl() Returns whether this dialect supports common SQL Data Definition Language (DDL) statements such as CREATE TABLE and DROP INDEX.
boolean	allowsOrderByAlias() Returns true if aliases defined in the SELECT clause can be used as expressions in the ORDER BY clause.
boolean	allowsRegularExpressionInWhereClause() Informs Mondrian if the dialect supports regular expressions when creating the 'where' or the 'having' clause.
String	generateInline(List<String> columnNames, List<String> columnTypes, List<String[]> valueList) Generates a SQL statement to represent an inline dataset.
String	generateRegularExpression(String source, String javaRegex) Must generate a String representing a regular expression match operation between a string literal and a Java regular expression.
void	quoteIdentifier(String val, StringBuilder buf) Appends to a buffer an identifier, quoted appropriately for this Dialect.
void	quoteStringLiteral(StringBuilder buf, String s) Appends to a buffer a single-quoted SQL string.
boolean	supportsResultSetConcurrency(int type, int concurrency) Returns whether this Dialect supports the given concurrency type in combination with the given result set type.

Methods inherited from class mondrian.spi.impl.JdbcDialectImpl

allowsCompoundCountDistinct, allowsCountDistinct, allowsCountDistinctWithOtherAggs, allowsDialectSharing, allowsFromQuery, allowsJoinOn, allowsMultipleCountDistinct, allowsMultipleDistinctSqlMeasures, allowsSelectNotInGroupBy, appendHintsAfterFromClause, caseWhenElse, computeStatisticsProviders, deduceIdentifierQuoteString, deduceMaxColumnNameLength, deduceProductName, deduceProductVersion, deduceReadOnly, deduceSupportedResultSetStyles, deduceSupportsSelectNotInGroupBy, extractEmbeddedFlags, generateCountExpression, generateInlineForAnsi, generateInlineGeneric, generateOrderByNulls, generateOrderByNullsAnsi, generateOrderItem, getDatabaseProduct, getMaxColumnNameLength, getProduct, getQuoteIdentifierString, getStatisticsProviders, getType, isDatabase, needsExponent, quote, quoteBooleanLiteral, quoteDateLiteral, quoteDateLiteral, quoteIdentifier, quoteIdentifier, quoteIdentifier, quoteNumericLiteral, quoteTimeLiteral, quoteTimestampLiteral, quoteTimestampLiteral, requiresAliasForFromQuery, requiresGroupByAlias, requiresHavingAlias, requiresOrderByAlias, requiresUnionOrderByExprToBeInSelectClause, requiresUnionOrderByOrdinal, supportsGroupByExpressions, supportsGroupingSets, supportsMultiValueInExpr, supportsUnlimitedValueList, toString, toUpper

Methods inherited from class java.lang.Object

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

Field Detail

FACTORY

public static final JdbcDialectFactory FACTORY

Constructor Detail

GoogleBigQueryDialect

public GoogleBigQueryDialect(Connection connection)
                      throws SQLException

Throws:

SQLException

Method Detail

allowsOrderByAlias

public boolean allowsOrderByAlias()

Description copied from interface: Dialect

Returns true if aliases defined in the SELECT clause can be used as expressions in the ORDER BY clause.

For example, in such a dialect,

SELECT x, x + y AS z FROM t ORDER BY z

would be legal.

MySQL, DB2 and Ingres are examples of dialects where this is true; Access is a dialect where this is false.

Specified by:

allowsOrderByAlias in interface Dialect

Overrides:

allowsOrderByAlias in class JdbcDialectImpl

Returns:

Whether aliases defined in the SELECT clause can be used as expressions in the ORDER BY clause.

allowsAs

public boolean allowsAs()

Description copied from interface: Dialect

Returns whether the SQL dialect allows "AS" in the FROM clause. If so, "SELECT * FROM t AS alias" is a valid query.

Specified by:

allowsAs in interface Dialect

Overrides:

allowsAs in class JdbcDialectImpl

Returns:

whether dialect allows AS in FROM clause

allowsDdl

public boolean allowsDdl()

Description copied from interface: Dialect

Returns whether this dialect supports common SQL Data Definition Language (DDL) statements such as CREATE TABLE and DROP INDEX.

Access seems to allow DDL iff the .mdb file is writeable.

Specified by:

allowsDdl in interface Dialect

Overrides:

allowsDdl in class JdbcDialectImpl

Returns:

whether this Dialect supports DDL

See Also:

DatabaseMetaData.isReadOnly()

supportsResultSetConcurrency

public boolean supportsResultSetConcurrency(int type,
                                            int concurrency)

Description copied from interface: Dialect

Returns whether this Dialect supports the given concurrency type in combination with the given result set type.

The result is similar to DatabaseMetaData.supportsResultSetConcurrency(int, int), except that the JdbcOdbc bridge in JDK 1.6 overstates its abilities. See bug 1690406.

Specified by:

supportsResultSetConcurrency in interface Dialect

Overrides:

supportsResultSetConcurrency in class JdbcDialectImpl

Parameters:

type - defined in ResultSet

concurrency - type defined in ResultSet

Returns:

true if so; false otherwise

generateInline

public String generateInline(List<String> columnNames,
                             List<String> columnTypes,
                             List<String[]> valueList)

Description copied from interface: Dialect

Generates a SQL statement to represent an inline dataset.

For example, for Oracle, generates

 SELECT 1 AS FOO, 'a' AS BAR FROM dual
 UNION ALL
 SELECT 2 AS FOO, 'b' AS BAR FROM dual
 

For ANSI SQL, generates:

 VALUES (1, 'a'), (2, 'b')
 

Specified by:

generateInline in interface Dialect

Overrides:

generateInline in class JdbcDialectImpl

Parameters:

columnNames - List of column names

columnTypes - List of column types ("String" or "Numeric")

valueList - List of rows values

Returns:

SQL string

quoteIdentifier

public void quoteIdentifier(String val,
                            StringBuilder buf)

Description copied from interface: Dialect

Appends to a buffer an identifier, quoted appropriately for this Dialect.

Specified by:

quoteIdentifier in interface Dialect

Overrides:

quoteIdentifier in class JdbcDialectImpl

Parameters:

val - identifier to quote (must not be null).

buf - Buffer

quoteStringLiteral

public void quoteStringLiteral(StringBuilder buf,
                               String s)

Description copied from interface: Dialect

Appends to a buffer a single-quoted SQL string.

For example, in the default dialect, quoteStringLiteral(buf, "Can't") appends "'Can''t'" to buf.

Specified by:

quoteStringLiteral in interface Dialect

Overrides:

quoteStringLiteral in class JdbcDialectImpl

Parameters:

buf - Buffer to append to

s - Literal

allowsRegularExpressionInWhereClause

public boolean allowsRegularExpressionInWhereClause()

Description copied from interface: Dialect

Informs Mondrian if the dialect supports regular expressions when creating the 'where' or the 'having' clause.

Specified by:

allowsRegularExpressionInWhereClause in interface Dialect

Overrides:

allowsRegularExpressionInWhereClause in class JdbcDialectImpl

Returns:

True if regular expressions are supported.

generateRegularExpression

public String generateRegularExpression(String source,
                                        String javaRegex)

Description copied from interface: Dialect

Must generate a String representing a regular expression match operation between a string literal and a Java regular expression. The string literal might be a column identifier or some other identifier, but the implementation must presume that it is already escaped and fit for use. The regular expression is not escaped and must be adapted to the proper dialect rules.

Postgres / Greenplum example:

generateRegularExpression( "'foodmart'.'customer_name'", "(?i).*oo.*") -> 'foodmart'.'customer_name' ~ "(?i).*oo.*"

Oracle example:

generateRegularExpression( "'foodmart'.'customer_name'", ".*oo.*") -> REGEXP_LIKE('foodmart'.'customer_name', ".*oo.*")

Dialects are allowed to return null if the dialect cannot convert that particular regular expression into something that the database would support.

Specified by:

generateRegularExpression in interface Dialect

Overrides:

generateRegularExpression in class JdbcDialectImpl

Parameters:

source - A String identifying the column to match against.

javaRegex - A Java regular expression to match against.

Returns:

A dialect specific matching operation, or null if the dialect cannot convert that particular regular expression into something that the database would support.