CQL reads (aka SELECT)

Data access specification and implementation for CQL.

This corresponds to the following RPC methods:

• get()
• get_slice()
• get_count()
• multiget_slice()
• multiget_count()
• get_range_slices()
• get_indexed_slices()

The initial check-in to trunk/ uses a syntax that looks like:

SELECT (FROM)? <CF> [USING CONSISTENCY.<LVL>] WHERE <EXPRESSION> [ROWLIMIT X] [COLLIMIT Y] [ASC|DESC]

Where:

• <CF> is the column family name.
• <EXPRESSION> consists of relations chained by the AND keyword.
• <LVL> corresponds to one of the enum values in the RPC interface(s).

What is still undone:

• Support for indexes
• Counts
• Complete test coverage

And of course, all of this is still very much open to further discussion.