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[#1681] Simulate empty GROUP BY () clause in Sybase ASE and Ingres,

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joining a dummy table and grouping by a constant field
This commit is contained in:
Lukas Eder 2012-08-05 23:29:43 +02:00
parent e5bbfbe4bf
commit 38286cb5df
1 changed files with 13 additions and 2 deletions
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15
jOOQ/src/main/java/org/jooq/impl/AbstractSubSelect.java
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@ -36,9 +36,11 @@
package org.jooq.impl;
import static java.util.Arrays.asList;
import static org.jooq.SQLDialect.ASE;
import static org.jooq.SQLDialect.CUBRID;
import static org.jooq.SQLDialect.DERBY;
import static org.jooq.SQLDialect.HSQLDB;
import static org.jooq.SQLDialect.INGRES;
import static org.jooq.SQLDialect.MYSQL;
import static org.jooq.SQLDialect.POSTGRES;
import static org.jooq.SQLDialect.SQLITE;
@ -485,6 +487,12 @@ implements
context.formatSeparator()
.keyword("from ")
.sql(getFrom());
// [#1681] Sybase ASE and Ingres need a cross-joined dummy table
// To be able to GROUP BY () empty sets
if (grouping && getGroupBy().isEmpty() && asList(ASE, INGRES).contains(context.getDialect())) {
context.sql(", (select 1 as x) as empty_grouping_dummy_table");
}
}
context.declareTables(false);
@ -517,10 +525,13 @@ implements
// [#1665] Empty GROUP BY () clauses need parentheses
if (getGroupBy().isEmpty()) {
// [#1681] TODO: Simulate this for Sybase ASE, Ingres
// [#1681] Use the constant field from the dummy table Sybase ASE, Ingres
if (asList(ASE, INGRES).contains(context.getDialect())) {
context.sql("empty_grouping_dummy_table.x");
}
// Some dialects don't support empty GROUP BY () clauses
if (asList(CUBRID, DERBY, HSQLDB, MYSQL, POSTGRES, SQLITE).contains(context.getDialect())) {
else if (asList(CUBRID, DERBY, HSQLDB, MYSQL, POSTGRES, SQLITE).contains(context.getDialect())) {
context.sql("1");
}