1 files changed, 58 insertions, 0 deletions
diff --git a/test/unionall2.test b/test/unionall2.test
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+++ b/test/unionall2.test
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+# 2020-12-22
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.  The
+# focus of this file is flattening UNION ALL sub-queries.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix unionall2
+
+do_execsql_test 1.0 {
+  CREATE TABLE t1(a, b);
+  CREATE TABLE t2(c, d);
+
+  CREATE VIEW v1 AS SELECT * FROM t1, t2;
+  CREATE VIEW v2 AS SELECT * FROM t1, t2;
+
+  CREATE VIEW vA AS
+    SELECT * FROM v1, (
+      SELECT * FROM t1 LEFT JOIN t2 ON (a=c)
+    )
+    UNION ALL
+    SELECT * FROM v1, v2
+}
+
+do_execsql_test 1.1 {
+  SELECT 1 FROM vA, vA, vA, vA, vA, vA, vA, vA, vA, vA
+}
+
+#-------------------------------------------------------------------------
+
+do_execsql_test 2.1 {
+  CREATE TABLE y1(a INTEGER, b);
+  CREATE TABLE y2(c INTEGER, d);
+
+  CREATE TABLE x3_a(a INTEGER PRIMARY KEY, b TEXT);
+  CREATE TABLE x3_b(c INTEGER PRIMARY KEY, d TEXT);
+}
+
+do_execsql_test 2.2 {
+
+  SELECT * FROM y1 CROSS JOIN y2 WHERE y1.a=y2.c AND y2.c IN (
+    SELECT a FROM x3_a UNION ALL
+    SELECT c FROM x3_b ORDER BY 1
+  )
+}
+
+
+
+finish_test