Tomasz Grabiec a9237c1666 schema: Revert back to the 1.7 layout of static compact tables in memory ...

We are using C* 3.x compatible layout in schema tables but want to
keep using the 1.7 layout in memory for compatibility during rolling
upgrade. This patch switches the schema and schema_builder classes
back to the old layout. Translation of layout happens when converting
to/from schema mutations.

Notable changes:

 1) Includes a revert of commit 6260f31e08
    "thrift: Update CQL mapping of static CFs".

 2) Brings back the "default_validation_class" schema attribute. In v3
    it can be dervied from column definitions, but in v2 it can't, so
    we have to store it.

 3) legacy_schema_migrator and schema_builder don't have to do
    conversions to v3, this is now handled by the v3_columns
    class. schema_builder works with the same layout as schema, that
    is v2.

 4) Includes a revert of commit 66991a7ccb
    "v3 schema test fixes"

Fixes #2555.

2017-07-19 09:52:15 +02:00

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