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--source include/have_innodb.inc
# This is the test for bug 51378. Unique index created
# through "create index" and "alter table add unique index"
# interfaces should not be treated as primary index if indexed
# columns contain one or more column prefix(es) (only prefix/part of
# the column is indexed)
# On the other hand, if there is a unique index covers all
# columns of a table, and they are non-null columns, and
# full length of the column are indexed, then this index
# will be created as primary index
# Following queries test various scenario, no mismatch
# error message should be printed.
# Create a table contains a BLOB column
create table bug51378 (
col1 int not null,
col2 blob not null,
col3 time not null) engine = innodb;
# Create following unique indexes on 'col1' and 'col2(31)'
# of the table, the index should not be treated as primary
# key because it indexes only first 31 bytes of col2.
# Thus it contains "column prefix", and will not be
# upgraded to primary index.
# There should not be mismatch message printed in the
# errorlog
create unique index idx on bug51378(col1, col2(31));
alter table bug51378 add unique index idx2(col1, col2(31));
# Unique index on 'col1' and 'col3' will be created as primary index,
# since the index does not contain column prefix
create unique index idx3 on bug51378(col1, col3);
# Show create table would show idx3 created as unique index, internally,
# idx3 is treated as primary index both by MySQL and Innodb
SHOW CREATE TABLE bug51378;
# "GEN_CLUST_INDEX" will be re-created as default primary index
# after idx3 is dropped
drop index idx3 on bug51378;
SHOW CREATE TABLE bug51378;
# Or we can add the primary key through alter table interfaces
alter table bug51378 add primary key idx3(col1, col2(31));
SHOW CREATE TABLE bug51378;
drop table bug51378;
# Or we can create such primary key through create table interfaces
create table bug51378 (
col1 int not null,
col2 blob not null,
col3 time not null, primary key(col1, col2(31))) engine = innodb;
# Unique index on one or more column prefix(es) will be created
# as non-cluster index
create unique index idx on bug51378(col1, col2(31));
SHOW CREATE TABLE bug51378;
drop table bug51378;
# If a table has a NULLABLE column, unique index on it will not
# be treated as primary index.
create table bug51378 (
col1 int not null,
col2 int ) engine = innodb;
# This will be created as non-cluster index since col2 is nullable
create unique index idx on bug51378(col1, col2);
SHOW CREATE TABLE bug51378;
drop table bug51378;
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