[Tarantool-patches] [PATCH] sql: raise an error on attempt to use HASH index in SQL

[Kirill Yukhin <kyukhin@tarantool.org>]

Since currently query planner is unable to use HASH indexes
and attempt to use it will likely lead to SEGFAULT, this
patch raises an error on attempt to open VDBE cursor
against HASH index.

Closes #4659
---

ChangeLog entry:
## Bugs fixed
### SQL
* Block using HASH indexes in SQL since scheduler is unable
  to use it properly (gh-4659).

Issue: https://github.com/tarantool/tarantool/issues/4659
Branch: https://github.com/tarantool/tarantool/tree/kyukhin/gh-4659-block-hash-index

 src/box/sql/build.c                            |  6 +++++
 test/sql-tap/gh-4659-block-hash-index.test.lua | 35 ++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100755 test/sql-tap/gh-4659-block-hash-index.test.lua

diff --git a/src/box/sql/build.c b/src/box/sql/build.c
index 0b60d2e..b429a4e 100644
--- a/src/box/sql/build.c
+++ b/src/box/sql/build.c
@@ -722,6 +722,12 @@ vdbe_emit_open_cursor(struct Parse *parse_context, int cursor, int index_id,
 		      struct space *space)
 {
 	assert(space != NULL);
+	if (space->index[index_id]->def->type != TREE) {
+		diag_set(ClientError, ER_UNSUPPORTED, "SQL",
+			 "using of non-TREE index type");
+		parse_context->is_aborted = true;
+		return -1;
+	}
 	return sqlVdbeAddOp4(parse_context->pVdbe, OP_IteratorOpen, cursor,
 				 index_id, 0, (void *) space, P4_SPACEPTR);
 }
diff --git a/test/sql-tap/gh-4659-block-hash-index.test.lua b/test/sql-tap/gh-4659-block-hash-index.test.lua
new file mode 100755
index 0000000..8c84e2d
--- /dev/null
+++ b/test/sql-tap/gh-4659-block-hash-index.test.lua
@@ -0,0 +1,35 @@
+#!/usr/bin/env tarantool
+test = require("sqltester")
+test:plan(2)
+
+-- gh-4782 - Raise an error in case space features HASH index.
+-- Make sure that in case of attempt to use HASH index
+-- from within SQL statement - an error is raised.
+-- This is actually a stub until we are unable to employ
+-- HASH index while planning a query.
+
+f = {
+    {'1', 'unsigned'},
+    {'2', 'string'},
+}
+
+s = box.schema.create_space("T1", {format = f})
+s:create_index('PK', {type = 'hash', parts = {'1'}})
+
+test:do_catchsql_test(
+    "blocked-hash-index-1",
+    "SELECT * FROM T1", {
+        1, "SQL does not support using of non-TREE index type"
+    })
+
+s = box.schema.create_space("T2", {format = f})
+s:create_index('PK', {parts = {'2'}})
+s:create_index('SK', {type = 'hash', parts = {'1'}})
+
+test:do_catchsql_test(
+    "blocked-hash-index-1",
+    "SELECT * FROM T2 INDEXED BY SK", {
+        1, "SQL does not support using of non-TREE index type"
+    })
+
+test:finish_test()
-- 
1.8.3.1