Per review by Serg, include start row with new line.
We are hoping we haven't annoyed people that prefered the old
way.
Adding an option for new lines seems like over-engineering in advance.
So if there are complaints, let them be known (JIRA), and we'll add
this under an option.
Test cases updated.
This feature adds the functionality of ignorability for indexes.
Indexes are not ignored be default.
To control index ignorability explicitly for a new index,
use IGNORE or NOT IGNORE as part of the index definition for
CREATE TABLE, CREATE INDEX, or ALTER TABLE.
Primary keys (explicit or implicit) cannot be made ignorable.
The table INFORMATION_SCHEMA.STATISTICS get a new column named IGNORED that
would store whether an index needs to be ignored or not.
