Merge pull request #11788 from ydb-platform/mergelibs-241120-1113

Library import 241120-1113

1 files changed, 127 insertions, 0 deletions

diff --git a/yql/essentials/tests/postgresql/cases/case.sql b/yql/essentials/tests/postgresql/cases/case.sql
new file mode 100644
index 0000000000..ab0cb6b39f
--- /dev/null
+++ b/yql/essentials/tests/postgresql/cases/case.sql
@@ -0,0 +1,127 @@
+--
+-- CASE
+-- Test the case statement
+--
+CREATE TABLE CASE_TBL (
+  i integer,
+  f double precision
+);
+CREATE TABLE CASE2_TBL (
+  i integer,
+  j integer
+);
+INSERT INTO CASE_TBL VALUES (1, 10.1);
+INSERT INTO CASE_TBL VALUES (2, 20.2);
+INSERT INTO CASE_TBL VALUES (3, -30.3);
+INSERT INTO CASE_TBL VALUES (4, NULL);
+INSERT INTO CASE2_TBL VALUES (1, -1);
+INSERT INTO CASE2_TBL VALUES (2, -2);
+INSERT INTO CASE2_TBL VALUES (3, -3);
+INSERT INTO CASE2_TBL VALUES (2, -4);
+INSERT INTO CASE2_TBL VALUES (1, NULL);
+INSERT INTO CASE2_TBL VALUES (NULL, -6);
+--
+-- Simplest examples without tables
+--
+SELECT '3' AS "One",
+  CASE
+    WHEN 1 < 2 THEN 3
+  END AS "Simple WHEN";
+SELECT '<NULL>' AS "One",
+  CASE
+    WHEN 1 > 2 THEN 3
+  END AS "Simple default";
+SELECT '3' AS "One",
+  CASE
+    WHEN 1 < 2 THEN 3
+    ELSE 4
+  END AS "Simple ELSE";
+SELECT '4' AS "One",
+  CASE
+    WHEN 1 > 2 THEN 3
+    ELSE 4
+  END AS "ELSE default";
+SELECT '6' AS "One",
+  CASE
+    WHEN 1 > 2 THEN 3
+    WHEN 4 < 5 THEN 6
+    ELSE 7
+  END AS "Two WHEN with default";
+SELECT '7' AS "None",
+   CASE WHEN random() < 0 THEN 1
+   END AS "NULL on no matches";
+-- Constant-expression folding shouldn't evaluate unreachable subexpressions
+SELECT CASE WHEN 1=0 THEN 1/0 WHEN 1=1 THEN 1 ELSE 2/0 END;
+SELECT CASE 1 WHEN 0 THEN 1/0 WHEN 1 THEN 1 ELSE 2/0 END;
+-- Test for cases involving untyped literals in test expression
+SELECT CASE 'a' WHEN 'a' THEN 1 ELSE 2 END;
+--
+-- Examples of targets involving tables
+--
+SELECT
+  CASE
+    WHEN i >= 3 THEN i
+  END AS ">= 3 or Null"
+  FROM CASE_TBL;
+SELECT
+  CASE WHEN i >= 3 THEN (i + i)
+       ELSE i
+  END AS "Simplest Math"
+  FROM CASE_TBL;
+SELECT i AS "Value",
+  CASE WHEN (i < 0) THEN 'small'
+       WHEN (i = 0) THEN 'zero'
+       WHEN (i = 1) THEN 'one'
+       WHEN (i = 2) THEN 'two'
+       ELSE 'big'
+  END AS "Category"
+  FROM CASE_TBL;
+SELECT
+  CASE WHEN ((i < 0) or (i < 0)) THEN 'small'
+       WHEN ((i = 0) or (i = 0)) THEN 'zero'
+       WHEN ((i = 1) or (i = 1)) THEN 'one'
+       WHEN ((i = 2) or (i = 2)) THEN 'two'
+       ELSE 'big'
+  END AS "Category"
+  FROM CASE_TBL;
+--
+-- Examples of qualifications involving tables
+--
+--
+-- NULLIF() and COALESCE()
+-- Shorthand forms for typical CASE constructs
+--  defined in the SQL standard.
+--
+SELECT * FROM CASE_TBL WHERE COALESCE(f,i) = 4;
+SELECT * FROM CASE_TBL WHERE NULLIF(f,i) = 2;
+SELECT COALESCE(a.f, b.i, b.j)
+  FROM CASE_TBL a, CASE2_TBL b;
+SELECT NULLIF(a.i,b.i) AS "NULLIF(a.i,b.i)",
+  NULLIF(b.i, 4) AS "NULLIF(b.i,4)"
+  FROM CASE_TBL a, CASE2_TBL b;
+--
+-- Nested CASE expressions
+--
+-- This test exercises a bug caused by aliasing econtext->caseValue_isNull
+-- with the isNull argument of the inner CASE's CaseExpr evaluation.  After
+-- evaluating the vol(null) expression in the inner CASE's second WHEN-clause,
+-- the isNull flag for the case test value incorrectly became true, causing
+-- the third WHEN-clause not to match.  The volatile function calls are needed
+-- to prevent constant-folding in the planner, which would hide the bug.
+-- Wrap this in a single transaction so the transient '=' operator doesn't
+-- cause problems in concurrent sessions
+BEGIN;
+ROLLBACK;
+-- Test multiple evaluation of a CASE arg that is a read/write object (#14472)
+-- Wrap this in a single transaction so the transient '=' operator doesn't
+-- cause problems in concurrent sessions
+BEGIN;
+ROLLBACK;
+-- Test interaction of CASE with ArrayCoerceExpr (bug #15471)
+BEGIN;
+ROLLBACK;
+--
+-- Clean up
+--
+DROP TABLE CASE_TBL;
+DROP TABLE CASE2_TBL;