Drupal\Core\Entity\Query\Sql\Condition class has no docblock

Also I think there are some old "Implements..." documented methods in this file that should be converted to inheritdoc.

Thanks for the patch!

A class (or anything else) needs a one-line summary to start its documentation.

+/**
+ * Extending a class from ConditionBase to implement condition clause existance
+ * checking in SQL queries.
+ */
 class Condition extends ConditionBase {

And for a class, this should start with a verb. We have standards on how to write documentation -- see
https://drupal.org/coding-standards/docs#classes
and this general section:
https://drupal.org/coding-standards/docs#drupal

The rest of the patch looks good.

Oops, the one-line documentation intended for the class got into a method instead.

I also have a suggestion for the one-line class documentation... How about:

Implements entity query conditions for SQL databases.

(This is a class specifically for entity query conditions, and I think we need to get that into the documentation.)

Thanks! Test failure is unrelated, and I don't think we need to hit "retest" as it's some "table not found" glitch in the test bot on one test. The patch looks good.