Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/19911
@bolkedebruin , @srowen , @gatorsmile .
PostgreSQL has `inheritance` between tables. Due to the following side
effects, I'm not sure about this PR. Any thoughts?
```sql
postgres=# CREATE TABLE parent(a INT);
CREATE TABLE
postgres=# CREATE TABLE child(b INT) INHERITS (parent);
CREATE TABLE
postgres=# INSERT INTO parent VALUES(1);
INSERT 0 1
postgres=# SELECT * FROM parent;
a
---
1
(1 row)
postgres=# INSERT INTO child VALUES(2);
INSERT 0 1
postgres=# SELECT * FROM parent;
a
---
1
2
(2 rows)
postgres=# SELECT * FROM child;
a | b
---+---
2 |
(1 row)
postgres=# TRUNCATE TABLE parent;
TRUNCATE TABLE
postgres=# SELECT * FROM parent;
a
---
(0 rows)
postgres=# SELECT * FROM child;
a | b
---+---
(0 rows)
```
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