mihaibudiu commented on code in PR #3640:
URL: https://github.com/apache/calcite/pull/3640#discussion_r1496781556
##########
core/src/main/java/org/apache/calcite/plan/RelOptUtil.java:
##########
@@ -286,6 +286,22 @@ public static Set<CorrelationId> getVariablesUsed(RelNode
rel) {
return visitor.vuv.variables;
}
+ /**
+ * Returns a set of variables used by the given list of sub-queries and its
descendants.
+ *
+ * <p> Internally it uses the {@link
org.apache.calcite.plan.RelOptUtil#getVariablesUsed}
Review Comment:
In general I would refrain from describing *implementation* in JavaDoc,
unless it is very relevant. JavaDoc is about what the function does, not how.
This comment can be a regular comment inside the function, although the
function is pretty clear as is.
##########
core/src/test/java/org/apache/calcite/test/JdbcTest.java:
##########
@@ -8217,6 +8217,75 @@ private void checkGetTimestamp(Connection con) throws
SQLException {
.returns("EXPR$0=[1, 1.1]\n");
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-6032";>[CALCITE-6032]
+ * NullPointerException in Reldecorrelator for a Multi level correlated
subquery</a>. */
+ @Test void testMultiLevelDecorrelation() throws Exception {
+ String hsqldbMemUrl = "jdbc:hsqldb:mem:.";
+ Connection baseConnection = DriverManager.getConnection(hsqldbMemUrl);
+ Statement baseStmt = baseConnection.createStatement();
+ baseStmt.execute("create table invoice (c5633_485 integer, c5633_503\n"
Review Comment:
this code looks like it's machine generated.
This makes it hard to read by a human.
##########
core/src/main/java/org/apache/calcite/plan/RelOptUtil.java:
##########
@@ -286,6 +286,22 @@ public static Set<CorrelationId> getVariablesUsed(RelNode
rel) {
return visitor.vuv.variables;
}
+ /**
+ * Returns a set of variables used by the given list of sub-queries and its
descendants.
+ *
+ * <p> Internally it uses the {@link
org.apache.calcite.plan.RelOptUtil#getVariablesUsed}
+ * to get all the variables used in the relational expression of a given
sub-query.
+ *
+ * <p> The item type is same as {@link
org.apache.calcite.rex.RexCorrelVariable#id}.
Review Comment:
I really don't know what item you are referring to here.
##########
core/src/main/java/org/apache/calcite/plan/RelOptUtil.java:
##########
@@ -286,6 +286,22 @@ public static Set<CorrelationId> getVariablesUsed(RelNode
rel) {
return visitor.vuv.variables;
}
+ /**
+ * Returns a set of variables used by the given list of sub-queries and its
descendants.
Review Comment:
"a" set is imprecise. I would say "the set"
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