method
can_perform_case_insensitive_comparison_for?
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Class: ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
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can_perform_case_insensitive_comparison_for?(column)
private
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# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 762 def can_perform_case_insensitive_comparison_for?(column) @case_insensitive_cache ||= {} @case_insensitive_cache[column.sql_type] ||= begin sql = SELECT exists( SELECT * FROM pg_proc INNER JOIN pg_cast ON casttarget::text::oidvector = proargtypes WHERE proname = 'lower' AND castsource = '#{column.sql_type}'::regtype::oid ) execute_and_clear(sql, "SCHEMA", []) do |result| result.getvalue(0, 0) end end end