Paul Lin created FLINK-25558:
--------------------------------
Summary: TableResult OK may be empty if returned by multiple
queries
Key: FLINK-25558
URL: https://issues.apache.org/jira/browse/FLINK-25558
Project: Flink
Issue Type: Bug
Reporter: Paul Lin
Many queries return `TABLE_RESULT_OK`, which is a static member for reducing
memory overhead. However, TableResult contains an iterator that can be read
once. That means if a query returns `TABLE_RESULT_OK` and it is read,
then`TABLE_RESULT_OK` returned by the following queries would be considered
empty.
It can be reproduced by simply printing two query results.
```
tEnv.executeSql("create table tbl_a (a string)").print();
tEnv.executeSql("create table tbl_b (a string)").print();
```
The output would be
```
+--------+
| result |
+--------+
| OK |
+--------+
1 row in set
Empty set
```
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