start of work to match cql2 against json

[bitner]

WORK IN PROGRESS
TODO:

• Arithmetic Operators
• Comparison Operators for Number
• Comparison Operators for Boolean
• Comparison Operators for Text
• Spatial Operators
• Temporal Operators
• Testing Framework for Reduce
• Implement Array Operators
• Implement Like
• Implement In
• Implement Is Null
• Implement Not
• Implement Between
• Implement Cast from BBox to geos geometry
• Implement basic comparison ops for singular timestamps / dates
• More tests!

[bitner]

So, trying to set this up so that the reduce function can actually be used for any CQL2 expression to collapse things that don't need to go through to the base data. So say you had a CQL2 query like foo = 2 +7, you could use reduce to convert that to foo = 9 . To do that, I'll need to make the json input an option, if it can look up a property in the json, it will replace it with the value in that json. The matches function just looks to see if running reduce has boiled the entire expression down into an Expr::Bool and if so returns that value, if it couldn't reduce it all the way it returns an error.

[kylebarron]

I don't really know CQL so I didn't look too closely at the body of reduce (yet)