Rails 6.0-stable fixes

These changes are from master and are required once 6.0.3 is out, but
break 6.0.0-6.0.2 unfortunately.

Author: dr-itz

lib/arjdbc/postgresql/adapter.rb

@@ -303,6 +303,10 @@ def supports_optimizer_hints?
       @has_pg_hint_plan
     end
 
+    def supports_common_table_expressions?
+      true
+    end
+
     def supports_lazy_transactions?
       true
     end
@@ -379,13 +383,19 @@ def exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil)
       end
     end
 
+    def execute_batch(statements, name = nil)
+      execute(combine_multi_statements(statements), name)
+    end
+
     def explain(arel, binds = [])
       sql, binds = to_sql_and_binds(arel, binds)
       ActiveRecord::ConnectionAdapters::PostgreSQL::ExplainPrettyPrinter.new.pp(exec_query("EXPLAIN #{sql}", 'EXPLAIN', binds))
     end
 
     # from ActiveRecord::ConnectionAdapters::PostgreSQL::DatabaseStatements
-    READ_QUERY = ActiveRecord::ConnectionAdapters::AbstractAdapter.build_read_query_regexp(:begin, :commit, :explain, :select, :set, :show, :release, :savepoint, :rollback) # :nodoc:
+    READ_QUERY = ActiveRecord::ConnectionAdapters::AbstractAdapter.build_read_query_regexp(
+      :begin, :commit, :explain, :select, :set, :show, :release, :savepoint, :rollback, :with
+    ) # :nodoc:
     private_constant :READ_QUERY
 
     def write_query?(sql) # :nodoc:
@@ -434,8 +444,8 @@ def build_insert_sql(insert) # :nodoc:
       sql
     end
 
-    def build_truncate_statements(*table_names)
-      "TRUNCATE TABLE #{table_names.map(&method(:quote_table_name)).join(", ")}"
+    def build_truncate_statements(table_names)
+      ["TRUNCATE TABLE #{table_names.map(&method(:quote_table_name)).join(", ")}"]
     end
 
     def all_schemas

lib/arjdbc/sqlite3/adapter.rb

@@ -97,6 +97,10 @@ def supports_json?
       true
     end
 
+    def supports_common_table_expressions?
+      database_version >= "3.8.3"
+    end
+
     def supports_insert_on_conflict?
       database_version >= "3.24.0"
     end
@@ -154,7 +158,9 @@ def disable_referential_integrity # :nodoc:
     # DATABASE STATEMENTS ======================================
     #++
 
-    READ_QUERY = ActiveRecord::ConnectionAdapters::AbstractAdapter.build_read_query_regexp(:begin, :commit, :explain, :select, :pragma, :release, :savepoint, :rollback) # :nodoc:
+    READ_QUERY = ActiveRecord::ConnectionAdapters::AbstractAdapter.build_read_query_regexp(
+      :begin, :commit, :explain, :select, :pragma, :release, :savepoint, :rollback, :with
+    ) # :nodoc:
     private_constant :READ_QUERY
 
     def write_query?(sql) # :nodoc:
@@ -317,11 +323,8 @@ def get_database_version # :nodoc:
       SQLite3Adapter::Version.new(query_value("SELECT sqlite_version(*)"))
     end
 
-    def build_truncate_statements(*table_names)
-      truncate_tables = table_names.map do |table_name|
-        "DELETE FROM #{quote_table_name(table_name)}"
-      end
-      combine_multi_statements(truncate_tables)
+    def build_truncate_statement(table_name)
+      "DELETE FROM #{quote_table_name(table_name)}"
     end
 
     def check_version