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This patch changes the interface for evaluating expressions, in order to allow for thread-safe expression evaluations and easier codegen. Thread safety is achieved via the ExprContext class, a light-weight container for expression tree evaluation state. Codegen is easier because more expressions can be cross-compiled to IR. See expr.h and expr-context.h for an overview of the API changes. See sort-exec-exprs.cc for a simple example of the new interface and hdfs-scanner.cc for a more complicated example. This patch has not been completely code reviewed and may need further cleanup/stylistic work, as well as additional perf work. Change-Id: I3e3baf14ebffd2687533d0cc01a6fb8ac4def849 Reviewed-on: http://gerrit.sjc.cloudera.com:8080/3459 Reviewed-by: Skye Wanderman-Milne <skye@cloudera.com> Tested-by: Skye Wanderman-Milne <skye@cloudera.com>