ADD: GroupByReducer, not completed
ADD: Aggregation functions on Field
ADD: AggregationFunc to String, not completed
ADD: AggFuncColumnDesc, ugly
FIX: GroupByReducer
MOD: collect the selected columns and groupby columns in listener
ADD: TableManager singleton
FIX: AggregationUtils, now support JDK6
ADD: Dive main, dump the query structure
Create Selector.java
MOD: Selector to src/db
ADD: JoinExecuter, not completed
FIX: schema to string
ADD: DbPathUtils, for create hdfs Path
MOD: JoinExecutor with multiple input
ADD: Schema toString() and createSchema() with table name
ADD: test of SchemaUtils.dumpColumns() and SchemaUtils.parseColumns()
MOD: JoinExecutor and MR.
The schema string includes the table name
ADD: TableDisplayer and TableGenerator
Merge branch 'tools'