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Merge pull request #39712 from arthurschreiber/arthur/use-subquery-for-information-schema

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Use a subquery when filtering `information_schema.tables` by `table_name`.
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Eileen M. Uchitelle 2020-06-25 09:59:07 -04:00 committed by GitHub
commit 0f6a4f5895
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1 changed files with 8 additions and 4 deletions
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12
activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb
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@ -203,10 +203,14 @@ module ActiveRecord
def data_source_sql(name = nil, type: nil)
scope = quoted_scope(name, type: type)
sql = +"SELECT table_name FROM information_schema.tables"
sql << " WHERE table_schema = #{scope[:schema]}"
sql << " AND table_name = #{scope[:name]}" if scope[:name]
sql << " AND table_type = #{scope[:type]}" if scope[:type]
sql = +"SELECT table_name FROM (SELECT * FROM information_schema.tables "
sql << " WHERE table_schema = #{scope[:schema]}) _subquery"
if scope[:type] || scope[:name]
conditions = []
conditions << "_subquery.table_type = #{scope[:type]}" if scope[:type]
conditions << "_subquery.table_name = #{scope[:name]}" if scope[:name]
sql << " WHERE #{conditions.join(" AND ")}"
end
sql
end