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  1. Phoenix
  2. PHOENIX-1167

Improve join capabilities

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Details

    • Task
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 3.0.0, 4.0.0
    • 4.3.0, 3.3.0
    • None
    • None

    Description

      1. Semi/anti joins: including "IN / NOT IN" tests operating on non-correlated sub-queries (PHOENIX-167).
      We can evaluate the sub-queries as sets and execute the outer query the same way as we now do IN clause.

      2. Other non-correlated sub-queries: having a comparison operator with no modifier or a comparison operator modified by ANY, SOME or ALL (PHOENIX-1168).
      a) The sub-query can/must be evaluated as a single value. (Like "= / !=" with no modifiers; Or in cases like "> / < / >= / <=" "ANY/SOME/ALL", either max() or min() can be applied to the sub-query).
      b) In cases like "= / !=" "ANY / SOME / ALL", they are equivalent to category 2 queries.

      3. General correlated sub-queries (PHOENIX-945):
      Need more sophisticated rewriting techniques to convert them into joins.

        • if none of the dependence of inner query on the outer query is equi condition, we are currently unable to handle them.

      4. Nested sub-queries: having sub-queries in the FROM clause.
      We are now able to handle most of them. Exceptions are PHOENIX-943, PHOENIX-944.

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            maryannxue Wei Xue
            maryannxue Wei Xue
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