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dd_table.cc
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/* Copyright (c) 2015, 2024, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql/dd/dd_table.h"
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <memory> // unique_ptr
#include <unordered_map>
#include "lex_string.h"
#include "m_string.h"
#include "my_alloc.h"
#include "my_base.h"
#include "my_dbug.h"
#include "my_io.h"
#include "my_sys.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/my_loglevel.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql/strings/dtoa.h"
#include "mysql/strings/int2str.h"
#include "mysql/strings/m_ctype.h"
#include "mysql/udf_registration_types.h"
#include "mysql_com.h"
#include "mysqld_error.h"
#include "sql/dd/cache/dictionary_client.h" // dd::cache::Dictionary_client
#include "sql/dd/collection.h" // dd::Collection
#include "sql/dd/dd.h" // dd::get_dictionary
#include "sql/dd/dictionary.h" // dd::Dictionary
// TODO: Avoid exposing dd/impl headers in public files.
#include "sql/dd/impl/dictionary_impl.h" // default_catalog_name
#include "sql/dd/impl/system_registry.h" // dd::System_tables
#include "sql/dd/impl/tables/dd_properties.h" // dd::tables:.DD_properties
#include "sql/dd/impl/utils.h" // dd::escape
#include "sql/dd/performance_schema/init.h" // performance_schema::
// set_PS_version_for_table
#include "sql-common/my_decimal.h"
#include "sql/create_field.h"
#include "sql/dd/dd_version.h" // DD_VERSION
#include "sql/dd/properties.h" // dd::Properties
#include "sql/dd/string_type.h"
#include "sql/dd/tablespace_id_owner_visitor.h" // visit_tablespace_id_owners
#include "sql/dd/types/abstract_table.h"
#include "sql/dd/types/check_constraint.h" // dd::Check_constraint
#include "sql/dd/types/column.h" // dd::Column
#include "sql/dd/types/column_type_element.h" // dd::Column_type_element
#include "sql/dd/types/foreign_key.h" // dd::Foreign_key
#include "sql/dd/types/foreign_key_element.h" // dd::Foreign_key_element
#include "sql/dd/types/index.h" // dd::Index
#include "sql/dd/types/index_element.h" // dd::Index_element
#include "sql/dd/types/object_table.h" // dd::Object_table
#include "sql/dd/types/partition.h" // dd::Partition
#include "sql/dd/types/partition_index.h" // dd::Partition_index
#include "sql/dd/types/partition_value.h" // dd::Partition_value
#include "sql/dd/types/schema.h" // dd::Schema
#include "sql/dd/types/table.h" // dd::Table
#include "sql/dd/types/tablespace.h" // dd::Tablespace
#include "sql/dd_table_share.h" // is_suitable_for_primary_key
#include "sql/debug_sync.h" // DEBUG_SYNC
#include "sql/default_values.h" // max_pack_length
#include "sql/enum_query_type.h"
#include "sql/field.h"
#include "sql/handler.h" // FK_NAME_DEFAULT_SUFFIX
#include "sql/item.h"
#include "sql/key.h"
#include "sql/key_spec.h"
#include "sql/log.h"
#include "sql/mdl.h"
#include "sql/mem_root_array.h"
#include "sql/mysqld.h" // lower_case_table_names
#include "sql/partition_element.h"
#include "sql/partition_info.h" // partition_info
#include "sql/psi_memory_key.h" // key_memory_frm
#include "sql/sql_check_constraint.h" // Sql_check_constraint_spec_list
#include "sql/sql_class.h" // THD
#include "sql/sql_const.h"
#include "sql/sql_gipk.h" // table_def_has_generated_invisible_primary_key
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
#include "sql/sql_parse.h"
#include "sql/sql_partition.h" // expr_to_string
#include "sql/sql_plugin_ref.h"
#include "sql/sql_show.h"
#include "sql/sql_table.h" // primary_key_name
#include "sql/srs_fetcher.h"
#include "sql/strfunc.h" // lex_cstring_handle
#include "sql/table.h"
#include "sql/thd_raii.h"
#include "sql_string.h"
#include "string_with_len.h"
#include "strmake.h"
#include "typelib.h"
namespace dd {
/**
Convert to and from new enum types in DD framework to current MySQL
server enum types. We have plans to retain both old and new enum
values in DD tables so as to handle client compatibility and
information schema requirements.
*/
dd::enum_column_types get_new_field_type(enum_field_types type) {
switch (type) {
case MYSQL_TYPE_DECIMAL:
return dd::enum_column_types::DECIMAL;
case MYSQL_TYPE_TINY:
return dd::enum_column_types::TINY;
case MYSQL_TYPE_SHORT:
return dd::enum_column_types::SHORT;
case MYSQL_TYPE_LONG:
return dd::enum_column_types::LONG;
case MYSQL_TYPE_FLOAT:
return dd::enum_column_types::FLOAT;
case MYSQL_TYPE_DOUBLE:
return dd::enum_column_types::DOUBLE;
case MYSQL_TYPE_NULL:
case MYSQL_TYPE_INVALID:
case MYSQL_TYPE_BOOL:
return dd::enum_column_types::TYPE_NULL;
case MYSQL_TYPE_TIMESTAMP:
return dd::enum_column_types::TIMESTAMP;
case MYSQL_TYPE_LONGLONG:
return dd::enum_column_types::LONGLONG;
case MYSQL_TYPE_INT24:
return dd::enum_column_types::INT24;
case MYSQL_TYPE_DATE:
return dd::enum_column_types::DATE;
case MYSQL_TYPE_TIME:
return dd::enum_column_types::TIME;
case MYSQL_TYPE_DATETIME:
return dd::enum_column_types::DATETIME;
case MYSQL_TYPE_YEAR:
return dd::enum_column_types::YEAR;
case MYSQL_TYPE_NEWDATE:
return dd::enum_column_types::NEWDATE;
case MYSQL_TYPE_VARCHAR:
return dd::enum_column_types::VARCHAR;
case MYSQL_TYPE_BIT:
return dd::enum_column_types::BIT;
case MYSQL_TYPE_TIMESTAMP2:
return dd::enum_column_types::TIMESTAMP2;
case MYSQL_TYPE_DATETIME2:
return dd::enum_column_types::DATETIME2;
case MYSQL_TYPE_TIME2:
return dd::enum_column_types::TIME2;
case MYSQL_TYPE_NEWDECIMAL:
return dd::enum_column_types::NEWDECIMAL;
case MYSQL_TYPE_ENUM:
return dd::enum_column_types::ENUM;
case MYSQL_TYPE_SET:
return dd::enum_column_types::SET;
case MYSQL_TYPE_TINY_BLOB:
return dd::enum_column_types::TINY_BLOB;
case MYSQL_TYPE_MEDIUM_BLOB:
return dd::enum_column_types::MEDIUM_BLOB;
case MYSQL_TYPE_LONG_BLOB:
return dd::enum_column_types::LONG_BLOB;
case MYSQL_TYPE_VECTOR:
return dd::enum_column_types::VECTOR;
case MYSQL_TYPE_BLOB:
return dd::enum_column_types::BLOB;
case MYSQL_TYPE_VAR_STRING:
return dd::enum_column_types::VAR_STRING;
case MYSQL_TYPE_STRING:
return dd::enum_column_types::STRING;
case MYSQL_TYPE_GEOMETRY:
return dd::enum_column_types::GEOMETRY;
case MYSQL_TYPE_JSON:
return dd::enum_column_types::JSON;
default:
break;
}
/* purecov: begin deadcode */
LogErr(ERROR_LEVEL, ER_DD_FAILSAFE, "field type.");
assert(false);
return dd::enum_column_types::LONG;
/* purecov: end */
}
/**
Function returns string representing column type by Create_field.
This is required for the IS implementation which uses views on DD
*/
dd::String_type get_sql_type_by_create_field(TABLE *table,
const Create_field &field) {
DBUG_TRACE;
unique_ptr_destroy_only<Field> fld(make_field(field, table->s));
fld->init(table);
// Read column display type.
char tmp[MAX_FIELD_WIDTH];
String type(tmp, sizeof(tmp), system_charset_info);
fld->sql_type(type);
dd::String_type col_display_str(type.ptr(), type.length());
return col_display_str;
}
/**
Helper method to get default value of column in the string
format. The default value prepared from this methods is stored
in the columns.default_value_utf8. This information is mostly
used by the I_S queries only.
For others, default value can be obtained from the columns.default_values.
@param[in] buf Default value buffer.
@param[in] table Table object.
@param[in] field Field information.
@param[in] col_obj DD column object for the field.
@param[out] def_value Default value is stored in the string format if
non-NULL default value is specified for the column.
Empty string is stored if no default value is
specified for the column.
def_value is *not* set if default value for the
column is nullptr.
*/
static void prepare_default_value_string(uchar *buf, TABLE *table,
const Create_field &field,
dd::Column *col_obj,
String *def_value) {
// Create a fake field with the default value buffer 'buf'.
unique_ptr_destroy_only<Field> f(
make_field(field, table->s, buf + 1, buf, 0));
f->init(table);
if (col_obj->has_no_default()) f->set_flag(NO_DEFAULT_VALUE_FLAG);
const bool has_default =
((f->type() != FIELD_TYPE_BLOB ||
f->has_insert_default_general_value_expression()) &&
!f->is_flag_set(NO_DEFAULT_VALUE_FLAG) &&
!(f->auto_flags & Field::NEXT_NUMBER));
if (f->gcol_info || !has_default) return;
// If we have DEFAULT (expression)
if (field.m_default_val_expr) {
// Convert from Basic_string to String
String default_val_expr(col_obj->default_option().c_str(),
col_obj->default_option().length(),
&my_charset_bin);
// convert the expression stored in default_option to UTF8
convert_and_print(&default_val_expr, def_value, system_charset_info);
return;
}
// If we have DEFAULT NOW()
if (f->has_insert_default_datetime_value_expression()) {
def_value->copy(STRING_WITH_LEN("CURRENT_TIMESTAMP"), system_charset_info);
if (f->decimals() > 0) def_value->append_parenthesized(f->decimals());
return;
}
// If NOT NULL
if (!f->is_null()) {
char tmp[MAX_FIELD_WIDTH];
String type(tmp, sizeof(tmp), f->charset());
const bool is_binary_type =
((f->type() == MYSQL_TYPE_VARCHAR || f->type() == MYSQL_TYPE_STRING) &&
f->is_flag_set(BINARY_FLAG) && f->charset() == &my_charset_bin);
if (f->type() == MYSQL_TYPE_BIT) {
longlong dec = f->val_int();
char *ptr = longlong2str(dec, tmp + 2, 2);
uint32 length = (uint32)(ptr - tmp);
tmp[0] = 'b';
tmp[1] = '\'';
tmp[length] = '\'';
type.length(length + 1);
} else if (is_binary_type) {
String type2;
char *ptr = type.c_ptr_safe();
// Get the default value.
f->val_str(&type2);
if (type2.length() > 0) {
/*
The default value for BINARY and VARBINARY type is converted to the
hex string if hex format is used for default value at the parsing
stage. Converting hex string to system_charset_info charset while
storing value in DD table might fail because of unsupported byte
value in hex string. Hence converting default value to printable
HEX encoded string before store.
The original format as supplied by user is lost after parsing stage.
So regardless of the type specified by the user, default for
varbinary/binary is stored in the printable HEX encoded format.
I_S queries and SHOW COLUMNS always list such default value in HEX
format instead of user specified one.
*/
*ptr++ = '0';
*ptr++ = 'x';
size_t len = bin_to_hex_str(ptr, type.length() - 2, type2.c_ptr_safe(),
strlen(type2.c_ptr_safe()));
type.length(len + 2);
} else
// For BINARY(0) and VARBINARY type with empty string as default value.
f->val_str(&type);
} else
f->val_str(&type);
if (type.length()) {
uint dummy_errors;
def_value->copy(type.ptr(), type.length(), f->charset(),
system_charset_info, &dummy_errors);
} else
def_value->copy(STRING_WITH_LEN(""), system_charset_info);
}
}
/**
Helper method to get numeric scale for types using
Create_field type object.
*/
bool get_field_numeric_scale(const Create_field *field, uint *scale) {
assert(*scale == 0);
switch (field->sql_type) {
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
/* For these types we show NULL in I_S if scale was not given. */
if (field->decimals != DECIMAL_NOT_SPECIFIED) {
*scale = field->decimals;
return false;
}
break;
case MYSQL_TYPE_NEWDECIMAL:
case MYSQL_TYPE_DECIMAL:
*scale = field->decimals;
return false;
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_INT24:
case MYSQL_TYPE_LONGLONG:
assert(field->decimals == 0);
default:
return true;
}
return true;
}
/**
Helper method to get numeric precision for types using
Create_field type object.
*/
bool get_field_numeric_precision(const Create_field *field,
uint *numeric_precision) {
switch (field->sql_type) {
// these value is taken from Field_XXX::max_display_length() -1
case MYSQL_TYPE_TINY:
*numeric_precision = 3;
return false;
case MYSQL_TYPE_SHORT:
*numeric_precision = 5;
return false;
case MYSQL_TYPE_INT24:
*numeric_precision = 7;
return false;
case MYSQL_TYPE_LONG:
*numeric_precision = 10;
return false;
case MYSQL_TYPE_LONGLONG:
if (field->is_unsigned)
*numeric_precision = 20;
else
*numeric_precision = 19;
return false;
case MYSQL_TYPE_BIT:
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
*numeric_precision = field->max_display_width_in_codepoints();
return false;
case MYSQL_TYPE_DECIMAL: {
uint tmp = field->max_display_width_in_codepoints();
if (!field->is_unsigned) tmp--;
if (field->decimals) tmp--;
*numeric_precision = tmp;
return false;
}
case MYSQL_TYPE_NEWDECIMAL:
*numeric_precision = my_decimal_length_to_precision(
field->max_display_width_in_codepoints(), field->decimals,
field->is_unsigned);
return false;
default:
return true;
}
return true;
}
/**
Helper method to get datetime precision for types using
Create_field type object.
*/
bool get_field_datetime_precision(const Create_field *field,
uint *datetime_precision) {
switch (field->sql_type) {
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_DATETIME2:
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_TIMESTAMP2:
*datetime_precision =
field->max_display_width_in_codepoints() > MAX_DATETIME_WIDTH
? (field->max_display_width_in_codepoints() - 1 -
MAX_DATETIME_WIDTH)
: 0;
return false;
case MYSQL_TYPE_TIME:
case MYSQL_TYPE_TIME2:
*datetime_precision =
field->max_display_width_in_codepoints() > MAX_TIME_WIDTH
? (field->max_display_width_in_codepoints() - 1 - MAX_TIME_WIDTH)
: 0;
return false;
default:
return true;
}
return true;
}
static dd::String_type now_with_opt_decimals(uint decimals) {
char buff[17 + 1 + 1 + 1 + 1];
String val(buff, sizeof(buff), &my_charset_bin);
val.length(0);
val.append("CURRENT_TIMESTAMP");
if (decimals > 0) val.append_parenthesized(decimals);
return dd::String_type(val.ptr(), val.length());
}
/**
Add column objects to dd::Abstract_table according to list of Create_field
objects.
*/
bool fill_dd_columns_from_create_fields(THD *thd, dd::Abstract_table *tab_obj,
const List<Create_field> &create_fields,
handler *file) {
// Helper class which takes care of restoration of
// THD::check_for_truncated_fields after it was temporarily changed to
// CHECK_FIELD_WARN in order to prepare default values and freeing buffer
// which is allocated for the same purpose.
class Context_handler {
private:
THD *m_thd;
uchar *m_buf;
enum_check_fields m_check_for_truncated_fields;
public:
Context_handler(THD *thd, uchar *buf)
: m_thd(thd),
m_buf(buf),
m_check_for_truncated_fields(m_thd->check_for_truncated_fields) {
// Set to warn about wrong default values.
m_thd->check_for_truncated_fields = CHECK_FIELD_WARN;
}
~Context_handler() {
// Delete buffer and restore context.
my_free(m_buf);
m_thd->check_for_truncated_fields = m_check_for_truncated_fields;
}
};
// Allocate buffer large enough to hold the largest field. Add one byte
// of potential null bit and leftover bits.
size_t bufsize = 1 + max_pack_length(create_fields);
// When accessing leftover bits in the preamble while preparing default
// values, the get_rec_buf() function applied will assume the buffer
// size to be at least two bytes.
bufsize = std::max<size_t>(2, bufsize);
uchar *buf = reinterpret_cast<uchar *>(
my_malloc(key_memory_DD_default_values, bufsize, MYF(MY_WME)));
if (!buf) return true; /* purecov: inspected */
// Use RAII to save old context and restore at function return.
Context_handler save_and_restore_thd_context(thd, buf);
// We need a fake table and share to generate the default values.
// We prepare these once, and reuse them for all fields.
TABLE table;
TABLE_SHARE share;
table.s = &share;
table.in_use = thd;
table.s->db_low_byte_first = file->low_byte_first();
//
// Iterate through all the table columns
//
for (const Create_field &field : create_fields) {
//
// Add new DD column
//
dd::Column *col_obj = tab_obj->add_column();
col_obj->set_name(field.field_name);
col_obj->set_type(dd::get_new_field_type(field.sql_type));
col_obj->set_char_length(field.max_display_width_in_bytes());
// Set result numeric scale.
uint value = 0;
if (get_field_numeric_scale(&field, &value) == false)
col_obj->set_numeric_scale(value);
// Set result numeric precision.
if (get_field_numeric_precision(&field, &value) == false)
col_obj->set_numeric_precision(value);
// Set result datetime precision.
if (get_field_datetime_precision(&field, &value) == false)
col_obj->set_datetime_precision(value);
col_obj->set_nullable(field.is_nullable);
col_obj->set_unsigned(field.is_unsigned);
col_obj->set_zerofill(field.is_zerofill);
col_obj->set_srs_id(field.m_srid);
// Check that the hidden type isn't the type that is used internally by
// storage engines.
assert(field.hidden != dd::Column::enum_hidden_type::HT_HIDDEN_SE);
col_obj->set_hidden(field.hidden);
/*
AUTO_INCREMENT, DEFAULT/ON UPDATE CURRENT_TIMESTAMP properties are
stored in Create_field::auto_flags.
*/
if (field.auto_flags & Field::DEFAULT_NOW)
col_obj->set_default_option(now_with_opt_decimals(field.decimals));
if (field.auto_flags & Field::ON_UPDATE_NOW)
col_obj->set_update_option(now_with_opt_decimals(field.decimals));
col_obj->set_auto_increment((field.auto_flags & Field::NEXT_NUMBER) != 0);
// Handle generated default
if (field.m_default_val_expr) {
char buffer[128];
String default_val_expr(buffer, sizeof(buffer), &my_charset_bin);
// Convert the expression from Item* to text
field.m_default_val_expr->print_expr(thd, &default_val_expr);
col_obj->set_default_option(
dd::String_type(default_val_expr.ptr(), default_val_expr.length()));
}
// Handle generated columns
if (field.gcol_info) {
/*
It is important to normalize the expression's text into the DD, to
make it independent from sql_mode. For example, 'a||b' means 'a OR b'
or 'CONCAT(a,b)', depending on if PIPES_AS_CONCAT is on. Using
Item::print(), we get self-sufficient text containing 'OR' or
'CONCAT'. If sql_mode later changes, it will not affect the column.
*/
char buffer[128];
String gc_expr(buffer, sizeof(buffer), &my_charset_bin);
col_obj->set_virtual(!field.stored_in_db);
field.gcol_info->print_expr(thd, &gc_expr);
col_obj->set_generation_expression(
dd::String_type(gc_expr.ptr(), gc_expr.length()));
// Prepare UTF expression for IS.
String gc_expr_for_IS;
convert_and_print(&gc_expr, &gc_expr_for_IS, system_charset_info);
col_obj->set_generation_expression_utf8(
dd::String_type(gc_expr_for_IS.ptr(), gc_expr_for_IS.length()));
}
if (field.comment.str && field.comment.length)
col_obj->set_comment(
dd::String_type(field.comment.str, field.comment.length));
// Collation ID
col_obj->set_collation_id(field.charset->number);
// Was collation supplied explicitly ?
col_obj->set_is_explicit_collation(field.is_explicit_collation);
/*
Store numeric scale for types relying on this info (old and new decimal
and floating point types). Also store 0 for integer types to simplify I_S
implementation.
*/
switch (field.sql_type) {
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
/* For these types we show NULL in I_S if scale was not given. */
if (field.decimals != DECIMAL_NOT_SPECIFIED)
col_obj->set_numeric_scale(field.decimals);
else {
assert(col_obj->is_numeric_scale_null());
}
break;
case MYSQL_TYPE_NEWDECIMAL:
case MYSQL_TYPE_DECIMAL:
col_obj->set_numeric_scale(field.decimals);
break;
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_INT24:
case MYSQL_TYPE_LONGLONG:
assert(field.decimals == 0);
col_obj->set_numeric_scale(0);
break;
default:
assert(col_obj->is_numeric_scale_null());
break;
}
//
// Set options
//
dd::Properties *col_options = &col_obj->options();
/*
Store flag indicating whether BIT type storage optimized or not.
We need to store this flag in DD to correctly handle the case
when SE starts supporting optimized BIT storage but still needs
to handle correctly columns which were created before this change.
*/
if (field.sql_type == MYSQL_TYPE_BIT)
col_options->set("treat_bit_as_char", field.treat_bit_as_char);
// Store geometry sub type
if (field.sql_type == MYSQL_TYPE_GEOMETRY) {
col_options->set("geom_type", field.geom_type);
}
// Field storage media and column format options
if (field.field_storage_type() != HA_SM_DEFAULT)
col_options->set("storage",
static_cast<uint32>(field.field_storage_type()));
if (field.column_format() != COLUMN_FORMAT_TYPE_DEFAULT)
col_options->set("column_format",
static_cast<uint32>(field.column_format()));
// NOT SECONDARY column option.
if (field.flags & NOT_SECONDARY_FLAG)
col_options->set("not_secondary", true);
if (field.is_array) {
col_options->set("is_array", true);
}
//
// Write intervals
//
uint i = 0;
if (field.interval) {
uchar buff[MAX_FIELD_WIDTH];
String tmp((char *)buff, sizeof(buff), &my_charset_bin);
tmp.length(0);
for (const char **pos = field.interval->type_names; *pos; pos++) {
//
// Create enum/set object
//
assert(col_obj->type() == dd::enum_column_types::SET ||
col_obj->type() == dd::enum_column_types::ENUM);
dd::Column_type_element *elem_obj = col_obj->add_element();
// Copy type_lengths[i] bytes including '\0'
// This helps store typelib names that are of different charsets.
dd::String_type interval_name(*pos, field.interval->type_lengths[i]);
elem_obj->set_name(interval_name);
i++;
}
}
// Store column display type in dd::Column
col_obj->set_column_type_utf8(get_sql_type_by_create_field(&table, field));
// Store element count in dd::Column
col_options->set("interval_count", i);
// Store geometry sub type
if (field.sql_type == MYSQL_TYPE_GEOMETRY) {
col_options->set("geom_type", field.geom_type);
}
// Reset the buffer and assign the column's default value.
memset(buf, 0, bufsize);
if (prepare_default_value(thd, buf, &table, field, col_obj)) return true;
/**
Storing default value specified for column in
columns.default_value_utf8. The values are stored in
string form here. This information is mostly used by the
I_S queries. For others, default value can be obtained from
the columns.default_values.
So now column.default_value_utf8 is not just used for
storing "CURRENT_TIMESTAMP" for timestamp columns but also
used to hold the default value of column of all types.
To get the default value in string form, buffer "buf"
prepared in prepare_default_value() is used.
*/
String def_val;
prepare_default_value_string(buf, &table, field, col_obj, &def_val);
if (def_val.ptr() != nullptr)
col_obj->set_default_value_utf8(
dd::String_type(def_val.ptr(), def_val.length()));
col_obj->set_engine_attribute(field.m_engine_attribute);
col_obj->set_secondary_engine_attribute(field.m_secondary_engine_attribute);
}
return false;
}
static dd::Index::enum_index_algorithm dd_get_new_index_algorithm_type(
enum ha_key_alg type) {
switch (type) {
case HA_KEY_ALG_SE_SPECIFIC:
return dd::Index::IA_SE_SPECIFIC;
case HA_KEY_ALG_BTREE:
return dd::Index::IA_BTREE;
case HA_KEY_ALG_RTREE:
return dd::Index::IA_RTREE;
case HA_KEY_ALG_HASH:
return dd::Index::IA_HASH;
case HA_KEY_ALG_FULLTEXT:
return dd::Index::IA_FULLTEXT;
}
/* purecov: begin deadcode */
LogErr(ERROR_LEVEL, ER_DD_FAILSAFE, "index algorithm.");
assert(false);
return dd::Index::IA_SE_SPECIFIC;
/* purecov: end */
}
static dd::Index::enum_index_type dd_get_new_index_type(const KEY *key) {
if (key->flags & HA_FULLTEXT) return dd::Index::IT_FULLTEXT;
if (key->flags & HA_SPATIAL) return dd::Index::IT_SPATIAL;
if (key->flags & HA_NOSAME) {
/*
mysql_prepare_create_table() marks PRIMARY KEY by assigning
KEY::name special value. We rely on this here and in several
other places in server (e.g. in sort_keys()).
*/
if (key->name == primary_key_name)
return dd::Index::IT_PRIMARY;
else
return dd::Index::IT_UNIQUE;
}
return dd::Index::IT_MULTIPLE;
}
/**
Add dd::Index_element objects to dd::Index/Table according to
KEY_PART_INFO array for the index.
*/
static void fill_dd_index_elements_from_key_parts(
const dd::Table *tab_obj, dd::Index *idx_obj, uint key_part_count,
const KEY_PART_INFO *key_parts, handler *file, bool is_primary_key) {
//
// Iterate through all the index element
//
const KEY_PART_INFO *key_part = key_parts;
const KEY_PART_INFO *key_part_end = key_parts + key_part_count;
for (uint key_part_no = 0; key_part != key_part_end;
++key_part, ++key_part_no) {
//
// Get reference to column object
//
const dd::Column *key_col_obj = nullptr;
{
int i = 0;
for (const dd::Column *c : tab_obj->columns()) {
// Skip hidden columns
if (c->is_se_hidden()) continue;
if (i == key_part->fieldnr) {
key_col_obj = c;
break;
}
i++;
}
}
assert(key_col_obj);
//
// Create new index element object
//
if (key_col_obj->column_key() == dd::Column::CK_NONE) {
// We might have a unique key that would be promoted as PRIMARY
dd::Index::enum_index_type idx_type = idx_obj->type();
if (is_primary_key) idx_type = dd::Index::IT_PRIMARY;
switch (idx_type) {
case dd::Index::IT_PRIMARY:
const_cast<dd::Column *>(key_col_obj)
->set_column_key(dd::Column::CK_PRIMARY);
break;
case dd::Index::IT_UNIQUE:
if (key_part == key_parts) {
if (key_part_count == 1)
const_cast<dd::Column *>(key_col_obj)
->set_column_key(dd::Column::CK_UNIQUE);
else
const_cast<dd::Column *>(key_col_obj)
->set_column_key(dd::Column::CK_MULTIPLE);
}
break;
case dd::Index::IT_MULTIPLE:
case dd::Index::IT_FULLTEXT:
case dd::Index::IT_SPATIAL:
if (key_part == key_parts)
const_cast<dd::Column *>(key_col_obj)
->set_column_key(dd::Column::CK_MULTIPLE);
break;
default:
assert(!"Invalid index type");
break;
}
}
dd::Index_element *idx_elem =
idx_obj->add_element(const_cast<dd::Column *>(key_col_obj));
idx_elem->set_length(key_part->length);
idx_elem->set_order(key_part->key_part_flag & HA_REVERSE_SORT
? Index_element::ORDER_DESC
: Index_element::ORDER_ASC);
//
// Set index order
//
if (file->index_flags(idx_obj->ordinal_position() - 1, key_part_no, false) &
HA_READ_ORDER)
idx_elem->set_order(key_part->key_part_flag & HA_REVERSE_SORT
? dd::Index_element::ORDER_DESC
: dd::Index_element::ORDER_ASC);
else
idx_elem->set_order(dd::Index_element::ORDER_UNDEF);
}
}
// Check if a given key is candidate to be promoted to primary key.
static bool is_candidate_primary_key(THD *thd, const KEY *key,
const List<Create_field> &create_fields) {
KEY_PART_INFO *key_part;
KEY_PART_INFO *key_part_end = key->key_part + key->user_defined_key_parts;
if (!(key->flags & HA_NOSAME) || (key->flags & HA_NULL_PART_KEY))
return false;
if (key->flags & HA_VIRTUAL_GEN_KEY) return false;
// Use temporary objects to get Field*
TABLE_SHARE share;
TABLE table;
table.s = &share;
table.in_use = thd;
for (key_part = key->key_part; key_part < key_part_end; key_part++) {
/* Create the Create_field object for this key_part */
Create_field *cfield;
List_iterator<Create_field> it(
const_cast<List<Create_field> &>(create_fields));
int i = 0;
while ((cfield = it++)) {
if (i == key_part->fieldnr) break;
i++;
}
// cfield can be nullptr if the while-loop above terminates without
// finding the column, which is highly unlikely to happen. In this
// situation, a crash would be more appropriate.
assert(cfield != nullptr);
if (cfield->is_array) return false;
/* Prepare Field* object from Create_field */
unique_ptr_destroy_only<Field> table_field(make_field(*cfield, table.s));
table_field->init(&table);
if (is_suitable_for_primary_key(key_part, table_field.get()) == false)
return false;
}
return true;
}
/** Add index objects to dd::Table according to array of KEY structures. */
static void fill_dd_indexes_from_keyinfo(
THD *thd, dd::Table *tab_obj, uint key_count, const KEY *keyinfo,
const List<Create_field> &create_fields, handler *file) {
/**
Currently the index order type is not persisted in new DD or in .FRM. In
I_S with new DD index order is calculated from the index type. That is,
the index order is always calculated as ascending except for FULLTEXT and
HASH index.
Type of index ordering(ASC/DESC/UNDEF) is property of handler and index
type. With the proper handler and the index type, index order type can be
easily retrieved.
So here using keyinfo with table share of handler to get the index order
type. If table share does not exist for handler then dummy_table_share
is created. Index order type value is stored in the
index_column_usage.index_order.
Note:
The keyinfo prepared here is some what different from one prepared at
table opening time.