fix a bug where tableA join tableB failed due to index sizes #548
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Due to the way we handle joins internally with the java key extractor i.e. over the input,
and how calcite handles joins i.e. a union type directly on the join. It was possible to get an out of bounds exception if you changed your sql join order from
tableA join tableB on tableA.col = tableB.coltotableA join tableB on tableB.col = tableA.col