Maksim Zhuravkov created IGNITE-19032:
-----------------------------------------
Summary: Sql. Conditions in NATURAL JOINs do not use type coercion
rules
Key: IGNITE-19032
URL: https://issues.apache.org/jira/browse/IGNITE-19032
Project: Ignite
Issue Type: Bug
Components: sql
Reporter: Maksim Zhuravkov
Fix For: 3.0.0-beta2
NATURAL JOINs do not use type coercion and that causes some queries to fail
with ClassCastException, even though equivalent JOINs complete successfully.
{code:java}
sql("CREATE TABLE T11 (c1 int primary key, c2 INTEGER)");
sql("CREATE TABLE T12 (c1 BIGINT primary key, c2 BIGINT)");
Transaction tx = CLUSTER_NODES.get(0).transactions().begin();
sql(tx, "INSERT INTO T11 VALUES(1, 2)");
sql(tx, "INSERT INTO T11 VALUES(2, 3)");
sql(tx, "INSERT INTO T12 VALUES(1, 2)");
sql(tx, "INSERT INTO T12 VALUES(2, 4)");
tx.commit();
sql("SELECT * FROM t11 NATURAL JOIN t12");
{code}
Error:
{code:java}
Caused by: java.lang.ClassCastException: class java.lang.Long cannot be cast to
class java.lang.Integer (java.lang.Long and java.lang.Integer are in module
java.base of loader 'bootstrap')
at
org.apache.ignite.internal.util.ColocationUtils.append(ColocationUtils.java:67)
at
org.apache.ignite.internal.sql.engine.util.HashFunctionFactoryImpl$TypesAwareHashFunction.hashOf(HashFunctionFactoryImpl.java:116)
at
org.apache.ignite.internal.sql.engine.trait.Partitioned.targets(Partitioned.java:47)
at
org.apache.ignite.internal.sql.engine.exec.rel.Outbox.flush(Outbox.java:242)
at
org.apache.ignite.internal.sql.engine.exec.rel.Outbox.push(Outbox.java:151)
at
org.apache.ignite.internal.sql.engine.exec.rel.SortNode.flush(SortNode.java:193)
at
org.apache.ignite.internal.sql.engine.exec.rel.SortNode.end(SortNode.java:154)
a
{code}
An equivalent query passes with no issues:
{code:java}
SELECT * FROM t11 JOIN t12 ON t11.c1 = t12.c1 AND t11.c2 = t12.c2
{code}
*Solution*
Because NATURAL JOINs equivalent to JOINs that with ON condition, it would be
better to rewrite them with equivalent JOINs with ON conditions prior to
optimisation (even at the parsing stage) to leverage the code that handles type
coercion.
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