Export sqlite3_column_table_name (#900)

sqlite3.go

@@ -19,6 +19,7 @@ package sqlite3
 #cgo CFLAGS: -DSQLITE_OMIT_DEPRECATED
 #cgo CFLAGS: -DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1
 #cgo CFLAGS: -DSQLITE_ENABLE_UPDATE_DELETE_LIMIT
+#cgo CFLAGS: -DSQLITE_ENABLE_COLUMN_METADATA
 #cgo CFLAGS: -Wno-deprecated-declarations
 #cgo linux,!android CFLAGS: -DHAVE_PREAD64=1 -DHAVE_PWRITE64=1
 #ifndef USE_LIBSQLITE3
@@ -2014,6 +2015,14 @@ func (s *SQLiteStmt) Readonly() bool {
 	return C.sqlite3_stmt_readonly(s.s) == 1
 }
 
+// ColumnTableName returns the table that is the origin of a particular result
+// column in a SELECT statement.
+//
+// See https://www.sqlite.org/c3ref/column_database_name.html
+func (s *SQLiteStmt) ColumnTableName(n int) string {
+        return C.GoString(C.sqlite3_column_table_name(s.s, C.int(n)))
+}
+
 // Close the rows.
 func (rc *SQLiteRows) Close() error {
 	rc.s.mu.Lock()