This is coming in light of https://drupal.org/node/691932#comment-2537356 which, really speaking, would also apply to non-field tables. So the easier solution is to just remove the table altering capabilities.having no future (should have been filed sooner so we could not have it in D8 but anyways). There is a clear inconsistency in how we allow contributed modules to treat field table schemas vs. table schemas from other modules. There are a number of reasons mentioned in
PASSED: [[SimpleTest]]: [MySQL] 64,399 pass(es).
PASSED: [[SimpleTest]]: [MySQL] 64,415 pass(es).
FAILED: [[SimpleTest]]: [MySQL] Unable to apply patch 2060629.d8.patch. Unable to apply patch. See the log in the details link for more information.