Fredy Wijaya bfb9ccc8e0 IMPALA-7832: Support for IF NOT EXISTS in ALTER TABLE ADD COLUMN(S) ...

This patch adds IF NOT EXISTS support in ALTER TABLE ADD COLUMN and
ALTER TABLE ADD COLUMNS. If IF NOT EXISTS is specified and a column
already exists with this name, no error is thrown. If IF NOT EXISTS
is specified for multiple columns and a column already exists, no
error is thrown and a new column that does not exist will be added.

Syntax:
ALTER TABLE tbl ADD COLUMN [IF NOT EXISTS] i int
ALTER TABLE tbl ADD [IF NOT EXISTS] COLUMNS (i int, j int)

Testing:
- Added new FE tests
- Ran all FE tests
- Updated E2E DDL tests
- Ran all E2E DDL tests

Change-Id: I60ed22c8a8eefa10e94ad3dedf32fe67c16642d9
Reviewed-on: http://gerrit.cloudera.org:8080/12181
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

2019-01-24 03:14:35 +00:00

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main

IMPALA-7832: Support for IF NOT EXISTS in ALTER TABLE ADD COLUMN(S)

2019-01-24 03:14:35 +00:00

test

IMPALA-7832: Support for IF NOT EXISTS in ALTER TABLE ADD COLUMN(S)

2019-01-24 03:14:35 +00:00