[Tarantool-patches] [PATCH v6 05/22] sql: check args of char()

[imeevma@tarantool.org]

After this patch, the argument types of the char() function will
be checked properly.

Part of #4159
---
 src/box/sql/func.c          | 13 +++++-----
 test/sql-tap/func5.test.lua | 51 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 57 insertions(+), 7 deletions(-)

diff --git a/src/box/sql/func.c b/src/box/sql/func.c
index ed972fdab..2d0aea801 100644
--- a/src/box/sql/func.c
+++ b/src/box/sql/func.c
@@ -1454,10 +1454,11 @@ charFunc(sql_context * context, int argc, sql_value ** argv)
 	for (i = 0; i < argc; i++) {
 		uint64_t x;
 		unsigned c;
-		if (sql_value_type(argv[i]) == MP_INT)
-			x = 0xfffd;
-		else
-			x = sql_value_uint64(argv[i]);
+		enum mp_type mp_type = sql_value_type(argv[i]);
+		if (mp_type == MP_NIL)
+			continue;
+		assert(mp_type == MP_UINT);
+		x = sql_value_uint64(argv[i]);
 		if (x > 0x10ffff)
 			x = 0xfffd;
 		c = (unsigned)(x & 0x1fffff);
@@ -2264,8 +2265,8 @@ static struct {
 	}, {
 	 .name = "CHAR",
 	 .param_count = -1,
-	 .first_arg = FIELD_TYPE_ANY,
-	 .args = FIELD_TYPE_ANY,
+	 .first_arg = FIELD_TYPE_UNSIGNED,
+	 .args = FIELD_TYPE_UNSIGNED,
 	 .is_blob_like_str = false,
 	 .returns = FIELD_TYPE_STRING,
 	 .is_deterministic = true,
diff --git a/test/sql-tap/func5.test.lua b/test/sql-tap/func5.test.lua
index 467ba7292..6e65b98ac 100755
--- a/test/sql-tap/func5.test.lua
+++ b/test/sql-tap/func5.test.lua
@@ -1,6 +1,6 @@
 #!/usr/bin/env tarantool
 test = require("sqltester")
-test:plan(50)
+test:plan(57)
 
 --!./tcltestrunner.lua
 -- 2010 August 27
@@ -493,4 +493,53 @@ test:do_catchsql_test(
         1, "Type mismatch: can not convert varbinary to number"
     })
 
+test:do_execsql_test(
+    "func-5-6.5.1", [[
+        SELECT char(NULL);
+    ]],{
+        ""
+    })
+
+test:do_execsql_test(
+    "func-5-6.5.2", [[
+        SELECT char(0x33);
+    ]], {
+        "3"
+    })
+
+test:do_catchsql_test(
+    "func-5-6.5.3", [[
+        SELECT char(-123);
+    ]], {
+        1, "Type mismatch: can not convert -123 to unsigned"
+    })
+
+test:do_catchsql_test(
+    "func-5-6.5.4", [[
+        SELECT char(-5.5);
+    ]], {
+        1, "Type mismatch: can not convert -5.5 to unsigned"
+    })
+
+test:do_catchsql_test(
+    "func-5-6.5.5", [[
+        SELECT char('-123');
+    ]], {
+        1, "Type mismatch: can not convert -123 to unsigned"
+    })
+
+test:do_catchsql_test(
+    "func-5-6.5.6", [[
+        SELECT char(false);
+    ]], {
+        1, "Type mismatch: can not convert FALSE to unsigned"
+    })
+
+test:do_catchsql_test(
+    "func-5-6.5.7", [[
+        SELECT char(X'3334');
+    ]], {
+        1, "Type mismatch: can not convert varbinary to unsigned"
+    })
+
 test:finish_test()
-- 
2.25.1