- MDEV-6695 Bad column name for UCS2 string literals

  The Item_string constructors called set_name() on the source string,
  which was wrong because in case of UCS2/UTF16/UTF32 the source value
  might be a not well formed string (e.g. have incomplete leftmost character).
  Now set_name() is called on str_value after its copied 
  (with optionally left zero padding) from the source string.
- MDEV-6694 Illegal mix of collation with a PS parameter
  Item_param::convert_str_value() did not set repertoire.
  Introducing a new structure MY_STRING_METADATA to collect
  character length and repertoire of a string in a single loop,
  to avoid two separate loops. Adding a new class Item_basic_value::Metadata
  as a convenience wrapper around MY_STRING_METADATA, to reuse the
  code between Item_string and Item_param.

1 files changed, 8 insertions, 0 deletions

diff --git a/include/m_ctype.h b/include/m_ctype.h
index 6f372002ebb..5994816cbfc 100644
--- a/include/m_ctype.h
+++ b/include/m_ctype.h
@@ -735,6 +735,14 @@ my_bool my_propagate_simple(CHARSET_INFO *cs, const uchar *str, size_t len);
 my_bool my_propagate_complex(CHARSET_INFO *cs, const uchar *str, size_t len);
 
 
+typedef struct 
+{
+  size_t char_length;
+  uint repertoire;
+} MY_STRING_METADATA;
+
+void my_string_metadata_get(MY_STRING_METADATA *metadata,
+                            CHARSET_INFO *cs, const char *str, size_t len);
 uint my_string_repertoire(CHARSET_INFO *cs, const char *str, ulong len);
 my_bool my_charset_is_ascii_based(CHARSET_INFO *cs);
 my_bool my_charset_is_8bit_pure_ascii(CHARSET_INFO *cs);