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From "Pawan Verma (Jira)" <j...@apache.org>
Subject [jira] [Created] (OFBIZ-11294) EntityQuery queryCount is throwing error with distinct method
Date Sat, 23 Nov 2019 12:15:00 GMT
Pawan Verma created OFBIZ-11294:
-----------------------------------

             Summary: EntityQuery queryCount is throwing error with distinct method
                 Key: OFBIZ-11294
                 URL: https://issues.apache.org/jira/browse/OFBIZ-11294
             Project: OFBiz
          Issue Type: Bug
          Components: framework
    Affects Versions: Release Branch 16.11, Trunk, Release Branch 17.12, Release Branch 18.12
            Reporter: Pawan Verma


We have a bug/missing support for distinct when used with queryCount method of EntityQuery.

Below is the more detail
{code:java}
EntityCondition cond = EntityCondition.makeCondition(UtilMisc.toList(
       EntityCondition.makeCondition("locationSeqId", "00test123"),
       EntityCondition.makeCondition("facilityId", EntityOperator.EQUALS, "10070"),
       EntityCondition.makeCondition("quantityOnHandTotal", EntityOperator.GREATER_THAN,
BigDecimal.ZERO)),
       EntityOperator.AND);{code}


*Case 1:* queryList().size() with distinct
{code:java}
int productAtLocation = EntityQuery.use(delegator).select("productId").from("InventoryItem")
       .where(cond).maxRows(2).distinct().queryList().size();{code}

Result Query: SELECT DISTINCT PRODUCT_ID FROM INVENTORY_ITEM WHERE ((LOCATION_SEQ_ID = ? AND
FACILITY_ID = ? AND QUANTITY_ON_HAND_TOTAL > ?))

 

Result: This case works well.


*Case 2:* queryCount without distinct


{code:java}
Long testCount = EntityQuery.use(delegator).select("productId").from("InventoryItem")
       .where(cond).maxRows(2).queryCount();{code}

Result Query: SELECT COUNT(1)  FROM INVENTORY_ITEM WHERE ((LOCATION_SEQ_ID = ? AND FACILITY_ID
= ? AND QUANTITY_ON_HAND_TOTAL > ?))

Result: This case also works well

*Case 3:*  queryCount with distinct
{code:java}
Long testCount = EntityQuery.use(delegator).select("productId").from("InventoryItem")
       .where(cond).maxRows(2).queryCount();{code}

Result Query: SELECT COUNT(DISTINCT *)  FROM INVENTORY_ITEM WHERE ((LOCATION_SEQ_ID = ? AND
FACILITY_ID = ? AND QUANTITY_ON_HAND_TOTAL > ?))

Result: This case throw an error
org.apache.ofbiz.entity.GenericDataSourceException: SQL Exception while executing the following:SELECT
COUNT(DISTINCT *) FROM OFBIZ.INVENTORY_ITEM (Syntax error: Encountered "*" at line 1, column
23.)

 


Below is the research I have done for the issue:

In EntityQuery.queryCount(), return method is delegator.findCountByCondition(). This method
doesn't have support for fieldsToSelect.
When we reach till GenericDAO.selectCountByCondition() at line 949, returning method is setting *null* for
selectFields.
And at the implementation of selectCountByCondition, at line 994 we have a check for selectFields,
that's why we are having *COUNT(DISTINCT *)* in our query.


To test this, I have used a simple way:
Just include below code at any groovy file and run it:
{code:java}
testCount = select("productId").from("InventoryItem").distinct().queryCount()
{code}
 

 



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