PARQUET-1787: Fix parsing expected distinct numbers

[garawalid]

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[garawalid]

@Fokko, @chenjunjiedada thanks for the review. Nice catch!

[chenjunjiedada]

@garawalid thanks for the patch, it looks good to me except one small nit for code style.

[chenjunjiedada]

@garawalid ， would you please update the pull request against the master?

[garawalid]

@chenjunjiedada I think it's better to wait for PARQUET-1805(#763) to be merged. I will rewrite the tests with the new configuration.
What do you think?

[garawalid]

@chenjunjiedada could you please review it again if you have some free time? Thanks.