private static boolean isFalseExpr(ExprNodeDesc expr) {
    return isBooleanExpr(expr) && 
        Boolean.FALSE.equals(((ExprNodeConstantDesc) expr).getValue());
  }
Get the partition list for the table that satisfies the partition pruner
condition.

@param tab
         the table object for the alias
@param prunerExpr
         the pruner expression for the alias
@param conf
         for checking whether "strict" mode is on.
@param alias
         for generating error message only.
@param prunedPartitionsMap
         cached result for the table
@return the partition list for the table that satisfies the partition
        pruner condition.
ql/src/java/org/apache/hadoop/hive/ql/optimizer/ppr/PartitionPruner.java