A Drupal schema definition is an array structure representing one or
more tables and their related keys and indexes. A schema is defined by
hook_schema(), which usually lives in a modulename.install file.
Reconcile small differences in the previous, manually created mysql
and pgsql schemas so they are the same and can be represented by a
single schema structure.
Users who still have a Drupal 6 database (and are in the process of
updating to Drupal 7) need extra help before a full bootstrap can be
achieved. This function does the necessary preliminary work that allows
the bootstrap to be successful.
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