should be it

external/duckdb/test/sql/alter/rename_col/test_rename_col.test

@@ -0,0 +1,17 @@
+# name: test/sql/alter/rename_col/test_rename_col.test
+# description: Test ALTER TABLE RENAME COLUMN
+# group: [rename_col]
+
+statement ok
+CREATE TABLE test(i INTEGER, j INTEGER)
+
+# rename the column
+statement ok
+ALTER TABLE test RENAME COLUMN i TO k
+
+statement ok
+SELECT * FROM test
+
+statement ok
+DROP TABLE IF EXISTS test
+

external/duckdb/test/sql/alter/rename_col/test_rename_col_check.test

@@ -0,0 +1,27 @@
+# name: test/sql/alter/rename_col/test_rename_col_check.test
+# description: Test ALTER TABLE RENAME COLUMN on a table with constraints: CHECK constraint
+# group: [rename_col]
+
+#  create a table with a check constraint referencing the to-be-renamed column
+statement ok
+CREATE TABLE test(i INTEGER CHECK(i < 10), j INTEGER)
+
+statement ok
+INSERT INTO test (i, j) VALUES (1, 2), (2, 3)
+
+statement error
+INSERT INTO test (i, j) VALUES (100, 2)
+----
+Constraint Error: CHECK constraint failed
+
+statement ok
+ALTER TABLE test RENAME COLUMN i TO k
+
+# the check should still work after the alter table
+statement ok
+INSERT INTO test (k, j) VALUES (1, 2), (2, 3)
+
+statement error
+INSERT INTO test (k, j) VALUES (100, 2)
+----
+Constraint Error: CHECK constraint failed

external/duckdb/test/sql/alter/rename_col/test_rename_col_dependencies.test

@@ -0,0 +1,28 @@
+# name: test/sql/alter/rename_col/test_rename_col_dependencies.test
+# description: Test ALTER TABLE RENAME COLUMN and dependencies
+# group: [rename_col]
+
+statement ok
+CREATE TABLE test(i INTEGER, j INTEGER)
+
+# create two prepared statements
+# one uses specific columns (i, j)
+# the other uses select *
+statement ok
+PREPARE v1 AS SELECT i, j FROM test
+
+statement ok
+PREPARE v2 AS SELECT * FROM test
+
+# now rename "i" to "k"
+statement ok
+ALTER TABLE test RENAME COLUMN i TO k
+
+# v1 does not work anymore: "i" does not exist
+statement error
+EXECUTE v1
+----
+
+# v2 still works
+statement ok
+EXECUTE v2

external/duckdb/test/sql/alter/rename_col/test_rename_col_failure.test

@@ -0,0 +1,21 @@
+# name: test/sql/alter/rename_col/test_rename_col_failure.test
+# description: Test failure conditions of ALTER TABLE
+# group: [rename_col]
+
+statement ok
+CREATE TABLE test(i INTEGER, j INTEGER)
+
+# cannot rename a column that does not exist
+statement error
+ALTER TABLE test RENAME COLUMN blablabla TO k
+----
+
+# cannot rename a column to an already existing column
+statement error
+ALTER TABLE test RENAME COLUMN i TO j
+----
+
+# after failure original columns should still be there
+statement ok
+SELECT i, j FROM test
+

external/duckdb/test/sql/alter/rename_col/test_rename_col_not_null.test

@@ -0,0 +1,26 @@
+# name: test/sql/alter/rename_col/test_rename_col_not_null.test
+# description: Test ALTER TABLE RENAME COLUMN on a table with constraints: NOT NULL constraint
+# group: [rename_col]
+
+statement ok
+CREATE TABLE test(i INTEGER NOT NULL, j INTEGER)
+
+statement ok
+INSERT INTO test (i, j) VALUES (1, 2), (2, 3)
+
+statement error
+INSERT INTO test (i, j) VALUES (NULL, 2)
+----
+Constraint Error: NOT NULL constraint failed: test.i
+
+statement ok
+ALTER TABLE test RENAME COLUMN i TO k
+
+# the not null constraint should still work after altering the table
+statement ok
+INSERT INTO test (k, j) VALUES (1, 2), (2, 3)
+
+statement error
+INSERT INTO test (k, j) VALUES (NULL, 2)
+----
+Constraint Error: NOT NULL constraint failed: test.k

external/duckdb/test/sql/alter/rename_col/test_rename_col_rollback.test

@@ -0,0 +1,36 @@
+# name: test/sql/alter/rename_col/test_rename_col_rollback.test
+# description: Test ALTER TABLE RENAME COLUMN with rollback
+# group: [rename_col]
+
+# CREATE TABLE
+statement ok
+CREATE TABLE test(i INTEGER, j INTEGER)
+
+statement ok
+START TRANSACTION
+
+# rename the column in the first transaction
+statement ok
+ALTER TABLE test RENAME COLUMN i TO k
+
+# now we should see the new name
+statement error
+SELECT i FROM test
+----
+Binder Error: Referenced column "i" not found in FROM clause
+
+statement ok
+SELECT k FROM test
+
+# rollback
+statement ok
+ROLLBACK
+
+# now we should see the old name again
+statement ok
+SELECT i FROM test
+
+statement error
+SELECT k FROM test
+----
+Binder Error: Referenced column "k" not found in FROM clause

external/duckdb/test/sql/alter/rename_col/test_rename_col_transactions.test

@@ -0,0 +1,62 @@
+# name: test/sql/alter/rename_col/test_rename_col_transactions.test
+# description: Test ALTER TABLE RENAME COLUMN with transactions
+# group: [rename_col]
+
+# CREATE TABLE
+statement ok con1
+CREATE TABLE test(
+	i INTEGER,
+	j INTEGER
+)
+
+# start two transactions
+statement ok con1
+START TRANSACTION
+
+statement ok con2
+START TRANSACTION
+
+# rename column in first transaction
+statement ok con1
+ALTER TABLE test RENAME COLUMN i TO k
+
+# first transaction should see the new name
+statement error con1
+SELECT i FROM test
+----
+
+statement ok con1
+SELECT k FROM test
+
+# second transaction should still consider old name
+statement ok con2
+SELECT i FROM test
+
+statement error con2
+SELECT k FROM test
+----
+
+# now commit
+statement ok con1
+COMMIT
+
+# second transaction should still see old name
+statement ok con2
+SELECT i FROM test
+
+statement error con2
+SELECT k FROM test
+----
+
+# now rollback the second transasction
+# it should now see the new name
+statement ok con2
+COMMIT
+
+statement error con1
+SELECT i FROM test
+----
+
+statement ok
+SELECT k FROM test
+

external/duckdb/test/sql/alter/rename_col/test_rename_col_unique.test

@@ -0,0 +1,27 @@
+# name: test/sql/alter/rename_col/test_rename_col_unique.test
+# description: Test ALTER TABLE RENAME COLUMN on a table with constraints: UNIQUE constraint
+# group: [rename_col]
+
+statement ok
+CREATE TABLE test(i INTEGER, j INTEGER, PRIMARY KEY(i, j))
+
+statement ok
+INSERT INTO test (i, j) VALUES (1, 1), (2, 2)
+
+statement error
+INSERT INTO test (i, j) VALUES (1, 1)
+----
+Constraint Error: Duplicate key "i: 1, j: 1"
+
+statement ok
+ALTER TABLE test RENAME COLUMN i TO k
+
+# the unique constraint should still work after altering the table
+# error message refers to the old name of the column (was i, renamed to k)
+statement ok
+INSERT INTO test (k, j) VALUES (3, 3), (4, 4)
+
+statement error
+INSERT INTO test (k, j) VALUES (1, 1)
+----
+Constraint Error: Duplicate key