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-rw-r--r--mysql-test/main/get_diagnostics.result28
-rw-r--r--mysql-test/main/get_diagnostics.test20
2 files changed, 48 insertions, 0 deletions
diff --git a/mysql-test/main/get_diagnostics.result b/mysql-test/main/get_diagnostics.result
index a884ebe3fe0..2e749fa21d7 100644
--- a/mysql-test/main/get_diagnostics.result
+++ b/mysql-test/main/get_diagnostics.result
@@ -1783,3 +1783,31 @@ SELECT @n;
@n
4
DROP TABLE t1;
+#
+# MDEV-26844: DELETE returns ROW_NUMBER=1 for every row upon
+# ER_TRUNCATED_WRONG_VALUE
+#
+# without ORDER BY
+CREATE TABLE t (a VARCHAR(8));
+INSERT INTO t VALUES ('val1'),('val2'),('100'),('val4');
+SELECT * FROM t;
+a
+val1
+val2
+100
+val4
+DELETE FROM t WHERE a = 100;
+Warnings:
+Warning 1292 Truncated incorrect DOUBLE value: 'val1'
+Warning 1292 Truncated incorrect DOUBLE value: 'val2'
+Warning 1292 Truncated incorrect DOUBLE value: 'val4'
+SHOW WARNINGS;
+Level Code Message
+Warning 1292 Truncated incorrect DOUBLE value: 'val1'
+Warning 1292 Truncated incorrect DOUBLE value: 'val2'
+Warning 1292 Truncated incorrect DOUBLE value: 'val4'
+GET DIAGNOSTICS CONDITION 3 @n = ROW_NUMBER;
+SELECT @n;
+@n
+4
+DROP TABLE t;
diff --git a/mysql-test/main/get_diagnostics.test b/mysql-test/main/get_diagnostics.test
index a1779f3c0ab..e8d81dca1e6 100644
--- a/mysql-test/main/get_diagnostics.test
+++ b/mysql-test/main/get_diagnostics.test
@@ -1667,3 +1667,23 @@ GET DIAGNOSTICS CONDITION 2 @n= ROW_NUMBER;
SELECT @n;
DROP TABLE t1;
+
+--echo #
+--echo # MDEV-26844: DELETE returns ROW_NUMBER=1 for every row upon
+--echo # ER_TRUNCATED_WRONG_VALUE
+--echo #
+
+--echo # without ORDER BY
+
+CREATE TABLE t (a VARCHAR(8));
+
+INSERT INTO t VALUES ('val1'),('val2'),('100'),('val4');
+SELECT * FROM t;
+
+DELETE FROM t WHERE a = 100;
+SHOW WARNINGS;
+
+GET DIAGNOSTICS CONDITION 3 @n = ROW_NUMBER;
+SELECT @n;
+
+DROP TABLE t;