should be it

external/duckdb/test/sql/parser/columns_aliases.test

@@ -0,0 +1,110 @@
+# name: test/sql/parser/columns_aliases.test
+# description: Test COLUMNS(*) aliases
+# group: [parser]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+CREATE TABLE integers AS SELECT 42 i, 84 j UNION ALL SELECT 13, 14
+
+# verify that COLUMNS(*) maintain names
+query II
+SELECT i, j FROM (SELECT COLUMNS(*)::VARCHAR FROM integers)
+----
+42	84
+13	14
+
+query IIII
+SELECT min_i, min_j, max_i, max_j FROM (SELECT MIN(COLUMNS(*)) AS "min_\0", MAX(COLUMNS(*)) AS "max_\0" FROM integers)
+----
+13	14	42	84
+
+# regex
+statement ok
+CREATE TABLE numerics AS SELECT 42 a42, 84 b84, 126 c126, 1000 d
+
+query III
+SELECT min_a, min_b, min_c FROM (SELECT MIN(COLUMNS('([a-z])\d+')) AS "min_\1" FROM numerics)
+----
+42	84	126
+
+# out of range - RE2 just swallows it
+query III
+SELECT min_, "min__1", "min__2" FROM (SELECT MIN(COLUMNS('([a-z])\d+')) AS "min_\2" FROM numerics)
+----
+42	84	126
+
+# escape
+query III
+SELECT "min_\a\", "min_\b\", "min_\c\" FROM (SELECT MIN(COLUMNS('([a-z])\d+')) AS "min_\\\1\\" FROM numerics)
+----
+42	84	126
+
+# multiple captures
+query III
+SELECT "a42aa", "b84bb", "c126cc" FROM (SELECT MIN(COLUMNS('([a-z])(\d+)')) AS "\1\2\1\1" FROM numerics)
+----
+42	84	126
+
+# unterminated escape \
+statement error
+SELECT MIN(COLUMNS('([a-z])\d+')) AS "\" FROM numerics
+----
+Backslashes must either be escaped or followed by a number
+
+# invalid backslash code \
+statement error
+SELECT MIN(COLUMNS('([a-z])\d+')) AS "\a" FROM numerics
+----
+Backslashes must either be escaped or followed by a number
+
+# no regex is supplied - cannot use \1
+statement error
+SELECT MIN(COLUMNS(*)) AS "min_\1" FROM numerics
+----
+no regex is supplied
+
+# generated columns
+statement ok
+CREATE TABLE tbl (
+	price INTEGER,
+	amount_sold INTEGER,
+	total_profit AS (price * amount_sold),
+);
+
+statement ok
+INSERT INTO tbl VALUES (5,4);
+
+query III
+SELECT price, amount_sold, total_profit FROM (SELECT COLUMNS(*)::VARCHAR FROM tbl)
+----
+5	4	20
+
+query III
+SELECT varchar_price, varchar_amount_sold, varchar_total_profit FROM (SELECT COLUMNS(*)::VARCHAR AS "varchar_\0" FROM tbl)
+----
+5	4	20
+
+# full outer join using
+statement ok
+create table a as select 42 as i, 80 as j;
+
+statement ok
+create table b as select 43 as i, 84 as k;
+
+statement ok
+create table c as select 44 as i, 84 as l;
+
+query III
+select i, j, k from (select columns(*)::VARCHAR from a full outer join b using (i)) order by 1;
+----
+42	80	NULL
+43	NULL	84
+
+query IIII
+select i, j, k, l from (select columns(*)::VARCHAR from a full outer join b using (i) full outer join c using (i)) order by 1;
+----
+42	80	NULL	NULL
+43	NULL	84	NULL
+44	NULL	NULL	84