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See https://issues.apache.org/jira/browse/PIG-200?focusedCommentId=13260155&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13260155
PIG-1188 Padding nulls to the input tuple according to input schema
PIG-200 Pig Performance Benchmarks
PIG-2824 Pushing checking number of fields into LoadFunc