From 347c164c35eddab388009470e6848cb361ac93f8 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 18 May 2024 15:22:53 +0200
Subject: Merging upstream version 1:10.11.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 sql/field.cc | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 56 insertions(+), 6 deletions(-)

(limited to 'sql/field.cc')

diff --git a/sql/field.cc b/sql/field.cc
index 76b7ff61..4fbcc181 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -1502,6 +1502,9 @@ bool Field::sp_prepare_and_store_item(THD *thd, Item **value)
   if (!(expr_item= thd->sp_fix_func_item_for_assignment(this, value)))
     goto error;
 
+  if (expr_item->check_is_evaluable_expression_or_error())
+    goto error;
+
   /* Save the value in the field. Convert the value if needed. */
 
   expr_item->save_in_field(this, 0);
@@ -5277,6 +5280,8 @@ int Field_timestamp::save_in_field(Field *to)
 {
   ulong sec_part;
   my_time_t ts= get_timestamp(&sec_part);
+  if (!ts && !sec_part)
+    return to->store_time_dec(Datetime::zero().get_mysql_time(), decimals());
   return to->store_timestamp_dec(Timeval(ts, sec_part), decimals());
 }
 
@@ -5398,11 +5403,33 @@ int Field_timestamp::store(longlong nr, bool unsigned_val)
 }
 
 
-int Field_timestamp::store_timestamp_dec(const timeval &ts, uint dec)
+int Field_timestamp::store_timestamp_dec(const timeval &tv, uint dec)
 {
   int warn= 0;
   time_round_mode_t mode= Datetime::default_round_mode(get_thd());
-  store_TIMESTAMP(Timestamp(ts).round(decimals(), mode, &warn));
+  const Timestamp ts= Timestamp(tv).round(decimals(), mode, &warn);
+  store_TIMESTAMP(ts);
+  if (ts.tv().tv_sec == 0 && ts.tv().tv_usec == 0)
+  {
+    /*
+      The value {tv_sec==0, tv_usec==0} here means '1970-01-01 00:00:00 +00'.
+      It does not mean zero datetime! because store_timestamp_dec() knows
+      nothing about zero dates. It inserts only real timeval values.
+      Zero ts={0,0} here is possible in two scenarios:
+      - the passed tv was already {0,0} meaning '1970-01-01 00:00:00 +00'
+      - the passed tv had some microseconds but they were rounded/truncated
+        to zero: '1970-01-01 00:00:00.1 +00' -> '1970-01-01 00:00:00 +00'.
+      It does not matter whether rounding/truncation really happened.
+      In both cases the call for store_TIMESTAMP(ts) above re-interpreted
+      '1970-01-01 00:00:00 +00:00' to zero date. Return 1 no matter what
+      sql_mode is. Even if sql_mode allows zero dates, there is still a problem
+      here: '1970-01-01 00:00:00 +00' could not be stored as-is!
+    */
+    ErrConvString str(STRING_WITH_LEN("1970-01-01 00:00:00 +00:00"),
+                      system_charset_info);
+    set_datetime_warning(ER_WARN_DATA_OUT_OF_RANGE, &str, "datetime", 1);
+    return 1; // '1970-01-01 00:00:00 +00' was converted to a zero date
+  }
   if (warn)
   {
     /*
@@ -5416,9 +5443,6 @@ int Field_timestamp::store_timestamp_dec(const timeval &ts, uint dec)
     */
     set_warning(Sql_condition::WARN_LEVEL_WARN, ER_WARN_DATA_OUT_OF_RANGE, 1);
   }
-  if (ts.tv_sec == 0 && ts.tv_usec == 0 &&
-      get_thd()->variables.sql_mode & (ulonglong) TIME_NO_ZERO_DATE)
-    return zero_time_stored_return_code_with_warning();
   return 0;
 }
 
@@ -5789,8 +5813,10 @@ my_time_t Field_timestampf::get_timestamp(const uchar *pos,
 bool Field_timestampf::val_native(Native *to)
 {
   DBUG_ASSERT(marked_for_read());
+  char zero[8]= "\0\0\0\0\0\0\0";
+  DBUG_ASSERT(pack_length () <= sizeof(zero));
   // Check if it's '0000-00-00 00:00:00' rather than a real timestamp
-  if (ptr[0] == 0 && ptr[1] == 0 && ptr[2] == 0 && ptr[3] == 0)
+  if (!memcmp(ptr, zero, pack_length()))
   {
     to->length(0);
     return false;
@@ -11481,6 +11507,30 @@ bool Field::validate_value_in_record_with_warn(THD *thd, const uchar *record)
 }
 
 
+/**
+  Find which reaction should be for IGNORE value.
+*/
+
+ignore_value_reaction find_ignore_reaction(THD *thd)
+{
+  enum_sql_command com= thd->lex->sql_command;
+
+  // All insert-like commands
+  if (com == SQLCOM_INSERT || com == SQLCOM_REPLACE ||
+      com == SQLCOM_INSERT_SELECT || com == SQLCOM_REPLACE_SELECT ||
+      com == SQLCOM_LOAD)
+  {
+    return IGNORE_MEANS_DEFAULT;
+  }
+  // Update commands
+  if (com == SQLCOM_UPDATE || com == SQLCOM_UPDATE_MULTI)
+  {
+    return IGNORE_MEANS_FIELD_VALUE;
+  }
+  return IGNORE_MEANS_ERROR;
+}
+
+
 bool Field::save_in_field_default_value(bool view_error_processing)
 {
   THD *thd= table->in_use;
-- 
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