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MONDRIAN: Enable dialect for Infobright 3.1 (fixes bug 2645300).
[git-p4: depot-paths = "//open/mondrian/": change = 12402]
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| // This software is subject to the terms of the Common Public License | ||
| // Agreement, available at the following URL: | ||
| // http://www.opensource.org/licenses/cpl.html. | ||
| // Copyright (C) 2008-2009 Julian Hyde | ||
| // All Rights Reserved. | ||
| // You must accept the terms of that agreement to use this software. | ||
| */ | ||
| package mondrian.spi.impl; | ||
|
|
||
| import java.sql.Connection; | ||
| import java.sql.SQLException; | ||
|
|
||
| /** | ||
| * Implementation of {@link mondrian.spi.Dialect} for the Infobright database. | ||
| * | ||
| * @author jhyde | ||
| * @version $Id$ | ||
| * @since Nov 23, 2008 | ||
| */ | ||
| public class InfobrightDialect extends MySqlDialect { | ||
|
|
||
| public static final JdbcDialectFactory FACTORY = | ||
| new JdbcDialectFactory( | ||
| InfobrightDialect.class, | ||
| // While we're choosing dialects, this still looks like a MySQL | ||
| // connection. | ||
| DatabaseProduct.MYSQL); | ||
|
|
||
| /** | ||
| * Creates an InfobrightDialect. | ||
| * | ||
| * @param connection Connection | ||
| */ | ||
| public InfobrightDialect(Connection connection) throws SQLException { | ||
| super(connection); | ||
| } | ||
|
|
||
| public DatabaseProduct getDatabaseProduct() { | ||
| return DatabaseProduct.INFOBRIGHT; | ||
| } | ||
|
|
||
| public boolean allowsCompoundCountDistinct() { | ||
| return false; | ||
| } | ||
|
|
||
| public boolean isNullsCollateLast() { | ||
| // Infobright is similar to MySQL, but apparently NULLs collate | ||
| // last. This is good news, because the workaround that we use on MySQL | ||
| // to force NULLs to collate last would kill Infobright's performance.an | ||
| return true; | ||
| } | ||
|
|
||
| public boolean supportsGroupByExpressions() { | ||
| return false; | ||
| } | ||
|
|
||
| public boolean requiresGroupByAlias() { | ||
| return true; | ||
| } | ||
|
|
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| public boolean allowsOrderByAlias() { | ||
| return false; | ||
| } | ||
|
|
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| public boolean requiresOrderByAlias() { | ||
| // Actually, Infobright doesn't ALLOW aliases to be used in the ORDER BY | ||
| // clause, let alone REQUIRE them. Infobright doesn't allow expressions | ||
| // in the ORDER BY clause, so returning true gives the right effect. | ||
| return true; | ||
| } | ||
|
|
||
| public boolean supportsMultiValueInExpr() { | ||
| // Infobright supports multi-value IN by falling through to MySQL, | ||
| // which is very slow (see for example | ||
| // PredicateFilterTest.testFilterAtSameLevel) so we pretend that it | ||
| // does not. | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| // End InfobrightDialect.java |
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