[jira] [Created] (FLINK-29765) SQL query not executing properly

["Aqib Mehmood (Jira)" <ji...@apache.org>]

Aqib Mehmood created FLINK-29765:
------------------------------------

             Summary: SQL query not executing properly
                 Key: FLINK-29765
                 URL: https://issues.apache.org/jira/browse/FLINK-29765
             Project: Flink
          Issue Type: Bug
    Affects Versions: 1.15.0
            Reporter: Aqib Mehmood


I am using this query to compare difference between last and second last price of our order sku
WITH CTE AS (
    SELECT a.sku, a.name, a.updatedAt, b.price FROM (    
        SELECT sku, name, max(updatedAt) AS updatedAt from (
            SELECT sku, name, updatedAt FROM wms.PurchaseOrderProduct
            WHERE CONCAT(sku, DATE_FORMAT(updatedAt, '%Y-%m-%d %H:%m:%s')) not in (
                SELECT CONCAT(sku, DATE_FORMAT(updatedAt, '%Y-%m-%d %H:%m:%s')) FROM (
                    SELECT sku, max(updatedAt) as updatedAt from wms.PurchaseOrderProduct
                    GROUP BY sku
                ) AS x
            )
        ) AS z
        GROUP BY sku, name
    ) AS a
    LEFT JOIN wms.PurchaseOrderProduct b
    ON a.sku=b.sku AND a.name=b.name and a.updatedAt=b.updatedAt
)
SELECT a.sku, a.name, a.updatedAt AS latestupdatedAt, a.price AS latestPrice, b.updatedAt AS lastUpdatedAt, b.price AS lastPrice
FROM (
    SELECT a.sku, a.name, a.updatedAt, b.price from (
        SELECT sku, name, max(updatedAt) as updatedAt from wms.PurchaseOrderProduct
        GROUP BY sku, name
    ) AS a
    LEFT JOIN wms.PurchaseOrderProduct b
    ON a.sku=b.sku AND a.name=b.name and a.updatedAt=b.updatedAt
) AS a
LEFT JOIN CTE AS b
ON a.sku=b.sku AND a.name=b.name;
This issue is that Im getting *NULLs* for columns *lastUpdatedAt* and {*}lastPrice{*}. But when I run the same query on our prod database, I'm getting desired results.I suspect that flink is not processing the entire query before giving the results.

I get desired results for a couple of rows in while *lastUpdatedAt* and *lastPrice* are not *NULL* in the beginning of the table{*}.{*} But then after that the entire two columns return *NULLs*
I would like to know why flink is not executing the above query properly?TIA



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