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MDEV-32645 CAST(AS UNSIGNED) fails with --view-protocol

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Item_float::neg() did not preserve the "presentation" from "this".
So
  CAST(-1e0 AS UNSIGNED)  -- cast from double to unsigned
changes its meaning to:
  CAST(-1 AS UNSIGNED)  -- cast signed to undigned

Fixing Item_float::neg() to construct the new value for
Item_float::presentation as follows:
- if the old value starts with minus, then the minus is truncated:
  '-2e0' -> '2e0'
- otherwise, minus sign followed by its old value:
  '1e0'  -> '-1e0'
This commit is contained in:
Alexander Barkov
2023-11-13 11:18:16 +04:00
parent ca276a0f3f
commit 9322ef03e3
4 changed files with 82 additions and 4 deletions
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3
mysql-test/main/cast.test
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@@ -768,14 +768,11 @@ INSERT INTO t1 VALUES (-1.0);
SELECT * FROM t1;
DROP TABLE t1;
#enable after MDEV-32645 is fixed
--disable_view_protocol
SELECT CAST(-1e0 AS UNSIGNED);
CREATE TABLE t1 (a BIGINT UNSIGNED);
INSERT INTO t1 VALUES (-1e0);
SELECT * FROM t1;
DROP TABLE t1;
--enable_view_protocol
SELECT CAST(-1e308 AS UNSIGNED);
CREATE TABLE t1 (a BIGINT UNSIGNED);