mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-18 13:02:28 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

refs #5333 simplify expand varchar code

Browse source 
git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@47627 c7de825b-a66e-492c-adef-691d508d4ae1
This commit is contained in:
Rich Prohaska 2012-09-09 19:42:27 +00:00 committed by Yoni Fogel
parent 505a4ec683
commit 4ca8e69ca3
2 changed files with 30 additions and 62 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
storage/tokudb/ha_tokudb.h
View file

@ -530,7 +530,7 @@ public:
int alter_table_add_index(TABLE *altered_table, Alter_inplace_info *ha_alter_info);
int alter_table_drop_index(TABLE *altered_table, Alter_inplace_info *ha_alter_info);
int alter_table_add_or_drop_column(TABLE *altered_table, Alter_inplace_info *ha_alter_info);
int alter_table_expand_varchar_columns(TABLE *altered_table, Alter_inplace_info *ha_alter_info);
int alter_table_expand_varchar_offsets(TABLE *altered_table, Alter_inplace_info *ha_alter_info);
int alter_table_expand_columns(TABLE *altered_table, Alter_inplace_info *ha_alter_info);
int alter_table_expand_one_column(TABLE *altered_table, Alter_inplace_info *ha_alter_info, int expand_field_num);
void print_alter_info(TABLE *altered_table, Alter_inplace_info *ha_alter_info);

90
storage/tokudb/ha_tokudb_alter_56.cc
View file

@ -141,34 +141,6 @@ fix_handler_flags(TABLE *table, TABLE *altered_table, Alter_inplace_info *ha_alt
}
}
// Mysql thinks that varchar(100) is a different type than varchar(300) due to the size of the length field.
// Therefore, it encodes an alter varchar expansion as a ALTER_COLUMN_TYPE rather than an ALTER_COLUMN_EQUAL_PACK_LENGTH.
// Try to change ALTER_COLUMN_TYPE to ALTER_COLUMN_EQUAL_PACK_LENGTH
if (handler_flags & Alter_inplace_info::ALTER_COLUMN_TYPE) {
bool change_it = false;
Dynamic_array<uint> changed_fields;
find_changed_fields(table, altered_table, ha_alter_info, changed_fields);
if (changed_fields.elements() > 0) {
change_it = true;
enum_field_types old_type, new_type;
for (int ai = 0; ai < changed_fields.elements(); ai++) {
uint i = changed_fields.at(ai);
Field *old_field = table->field[i];
old_type = old_field->real_type();
Field *new_field = altered_table->field[i];
new_type = new_field->real_type();
if (old_type != new_type)
change_it = false;
if (old_type != MYSQL_TYPE_VARCHAR || old_field->binary() != new_field->binary() || old_field->charset() != new_field->charset())
change_it = false;
}
}
if (change_it) {
handler_flags &= ~Alter_inplace_info::ALTER_COLUMN_TYPE;
handler_flags |= Alter_inplace_info::ALTER_COLUMN_EQUAL_PACK_LENGTH;
}
}
// always allow rename table + any other operation, so turn off the rename flag
if (handler_flags & Alter_inplace_info::TOKU_ALTER_RENAME) {
handler_flags &= ~Alter_inplace_info::TOKU_ALTER_RENAME;
@ -393,7 +365,7 @@ ha_tokudb::inplace_alter_table(TABLE *altered_table, Alter_inplace_info *ha_alte
}
}
if (error == 0 && ctx->expand_varchar_update_needed)
error = alter_table_expand_varchar_columns(altered_table, ha_alter_info);
error = alter_table_expand_varchar_offsets(altered_table, ha_alter_info);
if (error == 0 && ctx->expand_fixed_update_needed)
error = alter_table_expand_columns(altered_table, ha_alter_info);
@ -675,9 +647,9 @@ ha_tokudb::setup_kc_info(TABLE *altered_table, KEY_AND_COL_INFO *altered_kc_info
return error;
}
// Handle change column varchar expansion. For all clustered keys, broadcast an update message to readjust the varchar offsets.
// Expand the varchr offset from 1 to 2 bytes.
int
ha_tokudb::alter_table_expand_varchar_columns(TABLE *altered_table, Alter_inplace_info *ha_alter_info) {
ha_tokudb::alter_table_expand_varchar_offsets(TABLE *altered_table, Alter_inplace_info *ha_alter_info) {
int error = 0;
tokudb_alter_ctx *ctx = static_cast<tokudb_alter_ctx *>(ha_alter_info->handler_ctx);
@ -738,26 +710,21 @@ field_in_key(TABLE *table, Field *field) {
return false;
}
// Return true if all changed varchar field lengths can be changed inplace, otherwise return false
// Return true if all changed varchar/varbinary field lengths can be changed inplace, otherwise return false
static bool
change_varchar_length_is_supported(TABLE *table, TABLE *altered_table, Alter_inplace_info *ha_alter_info, tokudb_alter_ctx *ctx) {
for (int ai = 0; ai < ctx->changed_fields.elements(); ai++) {
uint i = ctx->changed_fields.at(ai);
Field *old_field = table->field[i];
enum_field_types old_type = old_field->real_type();
Field *new_field = altered_table->field[i];
enum_field_types new_type = new_field->real_type();
if (old_type != MYSQL_TYPE_VARCHAR || new_type != MYSQL_TYPE_VARCHAR || old_field->binary() != new_field->binary() || old_field->charset() != new_field->charset())
return false;
if (old_field->max_display_length() > new_field->max_display_length())
return false;
if (field_in_key(table, old_field))
return false;
if (ctx->table_kc_info->num_offset_bytes > ctx->altered_table_kc_info->num_offset_bytes)
return false; // something is wrong
if (ctx->table_kc_info->num_offset_bytes < ctx->altered_table_kc_info->num_offset_bytes)
ctx->expand_varchar_update_needed = true; // sum of varchar lengths changed from 1 to 2
}
change_varchar_length_is_supported(Field *old_field, Field *new_field, TABLE *table, TABLE *altered_table, Alter_inplace_info *ha_alter_info, tokudb_alter_ctx *ctx) {
enum_field_types old_type = old_field->real_type();
enum_field_types new_type = new_field->real_type();
if (old_type != MYSQL_TYPE_VARCHAR || new_type != MYSQL_TYPE_VARCHAR || old_field->binary() != new_field->binary() || old_field->charset() != new_field->charset())
return false;
if (old_field->max_display_length() > new_field->max_display_length())
return false;
if (field_in_key(table, old_field))
return false;
if (ctx->table_kc_info->num_offset_bytes > ctx->altered_table_kc_info->num_offset_bytes)
return false; // something is wrong
if (ctx->table_kc_info->num_offset_bytes < ctx->altered_table_kc_info->num_offset_bytes)
ctx->expand_varchar_update_needed = true; // sum of varchar lengths changed from 1 to 2
return true;
}
@ -767,21 +734,16 @@ change_length_is_supported(TABLE *table, TABLE *altered_table, Alter_inplace_inf
if (table->s->fields != altered_table->s->fields)
return false;
enum_field_types old_type, new_type;
for (int ai = 0; ai < ctx->changed_fields.elements(); ai++) {
uint i = ctx->changed_fields.at(ai);
Field *old_field = table->field[i];
old_type = old_field->real_type();
Field *new_field = altered_table->field[i];
new_type = new_field->real_type();
if (old_type != new_type)
// varchar(X) -> varchar(Y)
if (!change_varchar_length_is_supported(old_field, new_field, table, altered_table, ha_alter_info, ctx))
return false;
}
if (old_type == MYSQL_TYPE_VARCHAR)
return change_varchar_length_is_supported(table, altered_table, ha_alter_info, ctx);
else
return false;
return true;
}
static bool
@ -789,7 +751,7 @@ is_sorted(Dynamic_array<uint> &a) {
bool r = true;
if (a.elements() > 0) {
uint lastelement = a.at(0);
for (uint i = 1; i < a.elements(); i++)
for (int i = 1; i < a.elements(); i++)
if (lastelement > a.at(i))
r = false;
}
@ -950,19 +912,25 @@ change_fixed_length_is_supported(TABLE *table, TABLE *altered_table, Field *old_
// Return true if two field types can be changed inplace
static bool
change_type_is_supported(TABLE *table, TABLE *altered_table, Field *old_field, Field *new_field, tokudb_alter_ctx *ctx) {
change_type_is_supported(Field *old_field, Field *new_field, TABLE *table, TABLE *altered_table, Alter_inplace_info *ha_alter_info, tokudb_alter_ctx *ctx) {
enum_field_types old_type = old_field->real_type();
enum_field_types new_type = new_field->real_type();
if (is_int_type(old_type)) {
// int and unsigned int expansion
if (is_int_type(new_type) && is_unsigned(old_field) == is_unsigned(new_field))
return change_fixed_length_is_supported(table, altered_table, old_field, new_field, ctx);
else
return false;
} else if (old_type == MYSQL_TYPE_STRING) {
// char(X) -> char(Y) and binary(X) -> binary(Y) expansion
if (new_type == MYSQL_TYPE_STRING && old_field->binary() == new_field->binary())
return change_fixed_length_is_supported(table, altered_table, old_field, new_field, ctx);
else
return false;
} else if (old_type == MYSQL_TYPE_VARCHAR) {
// varchar(X) -> varchar(Y) and varbinary(X) -> varbinary(Y) expansion where X < 256 <= Y
// the ALTER_COLUMN_TYPE handler flag is set for these cases
return change_varchar_length_is_supported(old_field, new_field, table, altered_table, ha_alter_info, ctx);
} else
return false;
}
@ -976,7 +944,7 @@ change_type_is_supported(TABLE *table, TABLE *altered_table, Alter_inplace_info
uint i = ctx->changed_fields.at(ai);
Field *old_field = table->field[i];
Field *new_field = altered_table->field[i];
if (!change_type_is_supported(table, altered_table, old_field, new_field, ctx))
if (!change_type_is_supported(old_field, new_field, table, altered_table, ha_alter_info, ctx))
return false;
}
return true;