zabetak commented on a change in pull request #2430:
URL: https://github.com/apache/calcite/pull/2430#discussion_r648254743
##########
File path: core/src/main/java/org/apache/calcite/sql/SqlDialect.java
##########
@@ -1004,6 +1005,13 @@ public boolean supportsGroupByWithCube() {
return false;
}
+ /**
+ * Returns whether this dialect supports certain type of join in the
underlying DBMS.
Review comment:
Reword: "Returns whether this dialect support the specified type of
join."
##########
File path: core/src/main/java/org/apache/calcite/sql/SqlDialect.java
##########
@@ -1004,6 +1005,13 @@ public boolean supportsGroupByWithCube() {
return false;
}
+ /**
+ * Returns whether this dialect supports certain type of join in the
underlying DBMS.
+ */
+ public boolean isSupportedCertainJoinType(JoinRelType certainJoinType) {
Review comment:
Rename to `supportsJoinType` to be uniform with the other methods in
this class and the param to be simply `joinType`.
##########
File path: core/src/test/java/org/apache/calcite/test/JdbcAdapterTest.java
##########
@@ -1045,6 +1045,29 @@ private LockWrapper exclusiveCleanDb(Connection c)
throws SQLException {
.planHasSql("SELECT \"EMPNO\", \"ENAME\"\nFROM
\"SCOTT\".\"EMP\"\nWHERE \"EMPNO\" = ?");
}
+ /**
+ * Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-4619";>[CALCITE-4619]
+ * "Full join" generates an incorrect execution plan under mysql</a>
+ */
+ @Test void testSupportedCertainJoinType() {
+ CalciteAssert.model(JdbcTest.SCOTT_MYSQL_DIALECT_MODEL)
+ .query("select empno, ename, e.deptno, dname\n"
+ + "from scott.emp e full join scott.dept d\n"
+ + "on e.deptno = d.deptno")
+ .explainContains("PLAN=EnumerableCalc(expr#0..4=[{inputs}],
proj#0..2=[{exprs}], " +
+ "DNAME=[$t4])\n" +
+ " EnumerableHashJoin(condition=[=($2, $3)], joinType=[full])\n" +
+ " JdbcToEnumerableConverter\n" +
+ " JdbcProject(EMPNO=[$0], ENAME=[$1], DEPTNO=[$7])\n" +
+ " JdbcTableScan(table=[[SCOTT, EMP]])\n" +
+ " JdbcToEnumerableConverter\n" +
+ " JdbcProject(DEPTNO=[$0], DNAME=[$1])\n" +
+ " JdbcTableScan(table=[[SCOTT, DEPT]])")
+ .enable(CalciteAssert.DB == CalciteAssert.DatabaseInstance.HSQLDB)
+ .runs();
+ }
Review comment:
I think it would be better to move the test in `RelToSqlConverterTest`.
The class already contains dialect specific tests for MySQL and others and
doing so you do not need to add `TestSqlDialectFactoryImpl` class.
##########
File path: core/src/main/java/org/apache/calcite/sql/dialect/H2SqlDialect.java
##########
@@ -40,4 +41,8 @@ public H2SqlDialect(Context context) {
@Override public boolean supportsWindowFunctions() {
return false;
}
+
+ @Override public boolean isSupportedCertainJoinType(JoinRelType
certainJoinType) {
+ return certainJoinType != JoinRelType.FULL;
+ }
Review comment:
Add a test case using H2SqlDialect in `RelToSqlConverterTest`.
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