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  1. Teiid
  2. TEIID-3707

Wrong Data returned when a procedure is executed in the SELECT clause

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      Description

      I've found the following problem when executing a stored procedure in the SELECT clause. It calculates wrong data in a seemingly random fashion.

      This is a stored procedure which was created to determine whether a given coordinate lies within a specific rectangle. If this procedure is tested in a simple manner (SELECT .. FROM (EXEC ..)) the results are correctly retuned (0 = outside the rectangle and 1 otherwise).

          CREATE virtual procedure point_inside_store (
                                      pos_x float
                                     ,pos_y float
                ) RETURNS (
                       "insideFence" integer
                ) AS
                BEGIN
                   DECLARE integer insideFence = 0 ;
                   DECLARE float lowerLimit = 0.0 ;
                   DECLARE float upperLimit = 17.0 ;
                   DECLARE float leftLimit = 0.0 ;
                   DECLARE float rightLimit = 53.0 ;
                   IF (
                        pos_x >= leftLimit
                        AND pos_x <= rightLimit
                        AND pos_y >= lowerLimit
                        AND pos_y <= upperLimit
                   )
                   BEGIN
                        insideFence = 1 ;
                   END
                   SELECT
                          insideFence ;
               END
      

      If now the same procedure is included in a SELECT clause of a query:

          SELECT
              "citmp.KoordX"
              ,"citmp.KoordY"
              ,(
                  SELECT
                          "store.insideFence"
                      FROM
                          (
                              EXEC procs.point_inside_store (
                                  CAST (
                                      "citmp.KoordX" AS float
                                  )
                                  ,CAST (
                                      "citmp.KoordY" AS float
                                  )
                              )
                          ) as "store"
              ) as "insideStore"
              ,(
                  SELECT
                          "firstsection.insideFence"
                      FROM
                          (
                              EXEC procs.point_inside_store (
                                  CAST (
                                      "citmp.KoordX" AS float
                                  )
                                  ,CAST (
                                      "citmp.KoordY" AS float
                                  )
                              )
                          ) as "firstsection"
              ) as "insideFirstsection"
          FROM
              "test.sample_coords" as "citmp"
          ORDER BY
              insideStore ASC
              ,insideFirstsection DESC;;
      

      it calculates different results. The same coordinates that yielded 0 before now yield 1.

      Note that the main query has 2 columns executing the exact same procedure but there are result sets, that have different values in the last two columns. This should not be possible.
      In attachment you will find sample_coords table with a sample of coordinates.

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          Attachments

          1. highcpu-threads.png
            highcpu-threads.png
            20 kB
          2. out.1
            5 kB
          3. out.2
            6 kB
          4. out.3
            8 kB
          5. sample_coords.sql
            1.39 MB
          6. wrong_data.jpg
            wrong_data.jpg
            117 kB

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              • Assignee:
                shawkins Steven Hawkins
                Reporter:
                dalex005 dalex dalex
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                • Created:
                  Updated:
                  Resolved: