[PATCH 3/3 v2] sql: add test for indexed char in sub subquery

[Roman Khabibov <roman.habibov@tarantool.org>]

Add test to check result for indexed char in sub subquery.

Closes #3616
---
 test/sql-tap/select6.test.lua | 91 ++++++++++++++++++++++++++++++++++-
 1 file changed, 90 insertions(+), 1 deletion(-)

diff --git a/test/sql-tap/select6.test.lua b/test/sql-tap/select6.test.lua
index 6fdb4195e..a1fadb631 100755
--- a/test/sql-tap/select6.test.lua
+++ b/test/sql-tap/select6.test.lua
@@ -1,6 +1,6 @@
 #!/usr/bin/env tarantool
 test = require("sqltester")
-test:plan(83)
+test:plan(88)
 
 --!./tcltestrunner.lua
 -- 2001 September 15
@@ -1052,5 +1052,94 @@ test:do_execsql_test(
         -- </11.100>
     })
 
+-- gh-3616 Check result for indexed char in sub subquery.
+
+test:do_execsql_test(
+    12.1,
+    [[
+        DROP TABLE t1;
+        DROP TABLE t2;
+        CREATE TABLE t1 (s1 INT PRIMARY KEY, u CHAR UNIQUE);
+        CREATE TABLE t2 (s1 INT PRIMARY KEY, u CHAR);
+        INSERT INTO t1 VALUES (1,'');
+        INSERT INTO t2 VALUES (1,'');
+        SELECT COUNT(*) FROM t1 WHERE u IN
+                (SELECT u FROM t2 WHERE u IN (SELECT u FROM t1));
+    ]], {
+        -- <12.1>
+        1
+        -- </12.1>
+    })
+
+test:do_execsql_test(
+    12.2,
+    [[
+        DROP TABLE t1;
+        DROP TABLE t2;
+        CREATE TABLE t1 (s1 INT PRIMARY KEY, u CHAR);
+        CREATE TABLE t2 (s1 INT PRIMARY KEY, u CHAR);
+        INSERT INTO t1 VALUES (1,'');
+        INSERT INTO t2 VALUES (1,'');
+        SELECT COUNT(*) FROM t1 WHERE u IN
+                (SELECT u FROM t2 WHERE u IN (SELECT u FROM t1));
+    ]], {
+        -- <12.2>
+        1
+        -- </12.2>
+    })
+
+test:do_execsql_test(
+    12.3,
+    [[
+        DROP TABLE t1;
+        DROP TABLE t2;
+        CREATE TABLE t1 (s1 INT PRIMARY KEY, u INT UNIQUE);
+        CREATE TABLE t2 (s1 INT PRIMARY KEY, u INT);
+        INSERT INTO t1 VALUES (1, 0);
+        INSERT INTO t2 VALUES (1, 0);
+        SELECT COUNT(*) FROM t1 WHERE u IN
+                (SELECT u FROM t2 WHERE u IN (SELECT u FROM t1));
+    ]], {
+        -- <12.3>
+        1
+        -- </12.3>
+    })
+
+test:do_execsql_test(
+    12.4,
+    [[
+        DROP TABLE t1;
+        DROP TABLE t2;
+        CREATE TABLE t1 (s1 INT PRIMARY KEY, u INT);
+        CREATE TABLE t2 (s1 INT PRIMARY KEY, u INT);
+        INSERT INTO t1 VALUES (1, 0);
+        INSERT INTO t2 VALUES (1, 0);
+        SELECT COUNT(*) FROM t1 WHERE u IN
+                (SELECT u FROM t2 WHERE u IN (SELECT u FROM t1));
+    ]], {
+        -- <12.4>
+        1
+        -- </12.4>
+    })
+
+test:do_execsql_test(
+    12.5,
+    [[
+        DROP TABLE t1;
+        DROP TABLE t2;
+        CREATE TABLE t1 (s1 INT PRIMARY KEY, u INT);
+        CREATE TABLE t2 (s1 INT PRIMARY KEY, u INT);
+        INSERT INTO t1 VALUES (1, 0);
+        INSERT INTO t2 VALUES (1, 1);
+        SELECT COUNT(*) FROM t1 WHERE u IN
+                (SELECT u FROM t2 WHERE u IN (SELECT u FROM t1));
+        DROP TABLE t1;
+        DROP TABLE t2;
+    ]], {
+        -- <12.5>
+        0
+        -- </12.5>
+    })
+
 test:finish_test()
 
-- 
2.19.1