Add INFORMATION_SCHEMA.COLUMNS.DATETIME_PRECISION

Preserve domain name in columns and add CASCADE | RESTRICT to DROP DOMAIN

Fix MySQL compatibility ALTER TABLE DROP INDEX with schema

misc tiny refactorings

Minor changes in MERGE USING, DATE_TRUNC, and EXTRACT

Batch append mode for MVMap

Internal compiler believes that "3 warnings" is an error Issue #1214

Assorted minor changes

Fix SQL representation of CAST for types with fractional seconds precision

Unable to open database created with older version

Detect disabled tests