Dongjoon Hyun created TAJO-1574:
-----------------------------------
Summary: Fix NPE on natural join
Key: TAJO-1574
URL: https://issues.apache.org/jira/browse/TAJO-1574
Project: Tajo
Issue Type: Bug
Reporter: Dongjoon Hyun
Assignee: Dongjoon Hyun
Priority: Minor
NPE occurs in a natural join.
{code}
default> create table t(a int);
default> insert overwrite into t select 1;
default> create table s(a int);
default> insert overwrite into s select 1;
default> select * from t natural join s;
{code}
The main reason is *joinQual* is null.
{code}
public RESULT visitJoin(CONTEXT ctx, Stack<Expr> stack, Join expr) throws
PlanningException {
stack.push(expr);
- visit(ctx, stack, expr.getQual());
+ if (expr.getQual() != null) {
+ visit(ctx, stack, expr.getQual());
+ }
{code}
{code}
- join.joinQual = (Expr) joinQual.clone();
+ if (joinQual != null) {
+ join.joinQual = (Expr) joinQual.clone();
+ }
{code}
After fix, we need to get the following result.
{code}
default> select * from t natural join s;
Progress: 100%, response time: 0.293 sec
a, a
-------------------------------
1, 1
(1 rows, 0.293 sec, 4 B selected)
{code}
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