* 'master' of github.com:rails/arel:
  Make as factory method convert alias name to SqlLiteral
  Replace MathOperation with InfixOperation to support more operators

Propagates 'where' clauses when subquerying is triggered on the UpdateManager.

* 'master' of github.com:rails/arel:
  Add an #table_name method to Table and TableAlias, which always returns the actual table name, not the alias. Then fix ToSql#column_for to use this table name when checking whether the table exists (rather than before, where it was checking whether a table with the alias name exists, which was incorrect).

* stiff/master:
  implemented support for math operations in numeric attributes

Add an #table_name method to Table and TableAlias, which always returns the actual table name, not the alias. Then fix ToSql#column_for to use this table name when checking whether the table exists (rather than before, where it was checking whether a table with the alias name exists, which was incorrect).

* jstorimer/master:
  Allow database specific locking clauses to be used

* named-function-predicates:
  Test for NamedFunction predication chaining
  Chain predications off of named functions