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ScalarFnCall exprs will use codegen if the codegen object is already created, even if the operator calling the exprs does not codegen. This is good for performance. After the lazy codegen intitialization change, ScalarFnCalls in e.g. scan nodes were not using codegen because the fragment's codegen object would be created later in the Prepare() phase, hurting performance. To fix this, have codegen-enabled operators create the codegen object immediately before preparing child nodes / exprs. Change-Id: Id10e97d3fa2f1e5cfe9236fa1c83bea3384334b0 Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4566 Reviewed-by: Skye Wanderman-Milne <skye@cloudera.com> Tested-by: jenkins