Feat inverted index for mariadb

[eldadfux]

No description provided.

[kodumbeats]

Good work, just one section that could use a clarifying comment (in both find() and count())

[kodumbeats]

I found why the + characters were added for boolean fulltext search, but I'm struggling to follow the logic as to how this line gets used in the permissions ternary operator:

str_replace('+', '"', $this->getPDO()->quote(implode(' ', $roles)))

Can we add some comments to assist future maintainers?

[kodumbeats]

Performance gain is significant - below are tests at 100k records:

created.greater(), genre.equal()

roles    |      1   |   100    |    500   |   1000   |  2000
baseline | 0.5161 s | 0.5174 s | 0.6818 s | 0.8476 s | 1.0718 s
newindex | 0.0046 s | 0.0284 s | 0.1056 s | 0.2184 s | 0.4707 s

genre.equal(OR)

roles    |      1   |   100    |    500   |   1000   |  2000
baseline | 0.3802 s | 0.5840 s | 1.0252 s | 1.4866 s | 2.1468 s
newindex | 0.0021 s | 0.0141 s | 0.0793 s | 0.1867 s | 0.4308 s

views.greater()

roles    |      1   |   100    |    500   |   1000   |  2000
baseline | 0.3592 s | 0.6577 s | 1.4259 s | 2.3217 s | 3.9273 s
newindex | 0.0010 s | 0.0152 s | 0.0879 s | 0.1987 s | 0.4512 s

text.search()

roles    |      1   |   100    |    500   |   1000   |  2000
baseline | 3.0193 s | 3.1827 s | 3.7934 s | 4.6298 s | 6.0709 s
newindex | 0.2852 s | 0.0869 s | 0.1617 s | 0.2774 s | 0.5231 s

[eldadfux]

OK, this looks like a promising implementation so far, I think we should think if we need a few more tests to make sure the permissions functionality is working as expected. I will adapt the MySQL adapter to take advantage of native index capabilities and we can also compare the two.