Fix: dont expand bq pseudocolumns in optimizer star expansion #1826
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Should be good now @tobymao
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Bigquery has pseudocolumns for time ingestion partitioned tables. These pseudocolumns are
_PARTITIONTIMEandPARTITIONDATE. Both of these are reserved identifiers, furthermore neither are returned in * expansion by bigquery. So we should respect that during the optimizer's star expansion. To not do so would break a valid query (by adding reserved idents to the projection).