Ruby: make node column unique

Author: nickrolfe

ruby/generator/src/main.rs

@@ -260,7 +260,7 @@ fn create_ast_node_info_table<'a>(
             dbscheme::Column {
                 db_type: dbscheme::DbColumnType::Int,
                 name: "node",
-                unique: false,
+                unique: true,
                 ql_type: ql::Type::At(ast_node_name),
                 ql_type_is_ref: true,
             },

ruby/ql/lib/ruby.dbscheme

@@ -1326,7 +1326,7 @@ case @ruby_token.kind of
 
 #keyset[parent, parent_index]
 ruby_ast_node_info(
-  int node: @ruby_ast_node ref,
+  unique int node: @ruby_ast_node ref,
   int parent: @ruby_ast_node_parent ref,
   int parent_index: int ref,
   int loc: @location ref
@@ -1385,7 +1385,7 @@ case @erb_token.kind of
 
 #keyset[parent, parent_index]
 erb_ast_node_info(
-  int node: @erb_ast_node ref,
+  unique int node: @erb_ast_node ref,
   int parent: @erb_ast_node_parent ref,
   int parent_index: int ref,
   int loc: @location ref