"(Cond1 OR Cond2) AND (Cond1)" equal to "Cond1"
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 30/100
Research direction
Start by reproducing the reported EF Core LINQ query and inspecting its generated SQL, focusing on the null-semantics predicate around DATEADD. Confirm whether the redundant condition can be simplified without changing results, then add regression coverage for the generated query and verify the SQL output.
Written by the indexing model from the issue text.
Description
Hello,
EFCore: master (with some modifications).
Data provider: my own.
EFCore expression:
var recs=db.testTable.Where(r => r.DATA.AddYears(r.COL_INTEGER)==r.DATA.AddYears(1) && r.TEST_ID==testID);
Translated SQL:
SELECT "t"."TEST_ID", "t"."COL_INTEGER", "t"."COL_TIMESTAMP"
FROM "TEST_MODIFY_ROW" AS "t"
WHERE ((DATEADD(YEAR,"t"."COL_INTEGER","t"."COL_TIMESTAMP") = DATEADD(YEAR,1,"t"."COL_TIMESTAMP")) OR (("t"."COL_TIMESTAMP" IS NULL OR "t"."COL_INTEGER" IS NULL) AND "t"."COL_TIMESTAMP" IS NULL)) AND ("t"."TEST_ID" = :__testID_0)
If i right, you may replace
(("t"."COL_TIMESTAMP" IS NULL OR "t"."COL_INTEGER" IS NULL) AND "t"."COL_TIMESTAMP" IS NULL)
on the simple expression
"t"."COL_TIMESTAMP" IS NULL
:)
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