[Tarantool-patches] [PATCH v3 12/20] sql: add sql_stmt_schema_version()

[Nikita Pettik <korablev@tarantool.org>]

Let's introduce interface function to get schema version of prepared
statement. It is required since sturct sql_stmt (i.e. prepared
statement) is an opaque object and in fact is an alias to struct Vdbe.
Statements with schema version different from the current one are
considered to be expired and should be re-compiled.

Needed for #2592
---
 src/box/sql/sqlInt.h  | 3 +++
 src/box/sql/vdbeapi.c | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/src/box/sql/sqlInt.h b/src/box/sql/sqlInt.h
index 09f638268..7dfc29809 100644
--- a/src/box/sql/sqlInt.h
+++ b/src/box/sql/sqlInt.h
@@ -571,6 +571,9 @@ sql_column_name(sql_stmt *, int N);
 const char *
 sql_column_datatype(sql_stmt *, int N);
 
+uint32_t
+sql_stmt_schema_version(const struct sql_stmt *stmt);
+
 int
 sql_initialize(void);
 
diff --git a/src/box/sql/vdbeapi.c b/src/box/sql/vdbeapi.c
index b1c556ec3..7d9ce11e7 100644
--- a/src/box/sql/vdbeapi.c
+++ b/src/box/sql/vdbeapi.c
@@ -798,6 +798,13 @@ sql_column_decltype(sql_stmt * pStmt, int N)
 			  COLNAME_DECLTYPE);
 }
 
+uint32_t
+sql_stmt_schema_version(const struct sql_stmt *stmt)
+{
+	struct Vdbe *v = (struct Vdbe *) stmt;
+	return v->schema_ver;
+}
+
 /******************************* sql_bind_  **************************
  *
  * Routines used to attach values to wildcards in a compiled SQL statement.
-- 
2.15.1