Allow INSERT statements with SELECT notation (#1238)

Author: zurchpet

CHANGELOG.md

@@ -15,5 +15,6 @@
 
 - [#1215](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/1215) Fix mismatched foreign key errors
 - [#1228](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/1228) Enable identity insert on view's base table
+- [#1238](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/1238) Allow INSERT statements with SELECT notation
 
 Please check [7-1-stable](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/blob/7-1-stable/CHANGELOG.md) for previous changes.

lib/active_record/connection_adapters/sqlserver/schema_statements.rb

@@ -702,6 +702,7 @@ def get_raw_table_name(sql)
             s.split(/INSERT INTO/i)[1]
               .split(/OUTPUT INSERTED/i)[0]
               .split(/(DEFAULT)?\s+VALUES/i)[0]
+              .split(/\bSELECT\b(?![^\[]*\])/i)[0]
               .match(/\s*([^(]*)/i)[0]
           elsif s.match?(/^\s*UPDATE\s+.*/i)
             s.match(/UPDATE\s+([^\(\s]+)\s*/i)[1]

test/cases/schema_test_sqlserver.rb

@@ -96,6 +96,10 @@ class SchemaTestSQLServer < ActiveRecord::TestCase
       it do
         assert_equal "[test].[aliens]", connection.send(:get_raw_table_name, "EXEC sp_executesql N'INSERT INTO [test].[aliens] ([name]) OUTPUT INSERTED.[id] VALUES (@0)', N'@0 varchar(255)', @0 = 'Trisolarans'")
       end
+
+      it do
+        assert_equal "[with].[select notation]", connection.send(:get_raw_table_name, "INSERT INTO [with].[select notation] SELECT * FROM [table_name]")
+      end
     end
   end
 end