From 64a5fab00e68c1e684282180a6fdae73735cc95e Mon Sep 17 00:00:00 2001 From: Alexander Barkov Date: Sun, 22 May 2022 21:25:31 +0400 Subject: Step#1 MDEV-27896 Wrong result upon `COLLATE latin1_bin CHARACTER SET latin1` on the table or the database level - Adding data type aliases: using Lex_column_charset_collation_attrs_st = Lex_charset_collation_st; using Lex_column_charset_collation_attrs = Lex_charset_collation; and using them all around the code (except lex_charset.*) instead of the original names. - Renaming Lex_field_type_st::lex_charset_collation() to charset_collation_attrs() - Renaming Column_definition::set_lex_charset_collation() to set_charset_collation_attrs() - Renaming Column_definition::lex_charset_collation() to charset_collation_attrs() Rationale: The name "Lex_charset_collation" was a not very good name. It does not tell details about its properties: 1. if the charset is optional (yes) 2. if the collation is optional (yes) 3. if the charset can be exact (yes) or context (no) 4. if the collation can be: exact (yes) or context (yes) 5. if the clauses can be repeated multiple times (yes) We'll need a few new data types soon with different properties. For example, to fix MDEV-27896 and MDEV-27782, we'll need a new data type which is very like Lex_charset_collation, but additionally supports CHARACTER SET DEFAULT (which is allowed on table and database level, but is not allowed on the column level yet), i.e. with: "the charset can be exact (yes) or context (yes)" in N3. So we'll have to rename Lex_charset_collation to something else, e.g.: Lex_exact_charset_extended_collation_attrs, and add a new data type: e.g. Lex_extended_charset_extended_collation_attrs Also, we'll possibly allow CHARACTER SET DEFAULT at the column level for consistency with other places. So the storge on the column level can change: - from Lex_exact_charset_extended_collation_attrs - to Lex_extended_charset_extended_collation_attrs Adding the aliases introduces a convenient abstraction against upcoming renames and c++ data type changes. --- sql/item_func.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'sql/item_func.h') diff --git a/sql/item_func.h b/sql/item_func.h index 185242b7901..a4122f78e87 100644 --- a/sql/item_func.h +++ b/sql/item_func.h @@ -3773,7 +3773,7 @@ public: } bool set(const Type_handler *handler, const Lex_length_and_dec_st & length_and_dec, - const Lex_charset_collation_st &cscl, + const Lex_column_charset_collation_attrs_st &cscl, CHARSET_INFO *defcs) { CHARSET_INFO *tmp= cscl.resolved_to_character_set(defcs); -- cgit v1.2.1