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Hi Nishant
If you are creating your date column as PPI , then using the column in filter condition will lead to partition elimination and will enhance the performace. You may come across situation when it is not always possible to query on PI column so thats ok. However if you have created PPI on the table then you should attempt to use PPI column in your query for better results.
PPI + PI combination to use all the time in query is not possible. So its ok if user query on some other column which is not PI but actually PPI.
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Raj