[Spark] Fix case sensitive of delta statistic column #2758
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patsukp-db
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kamcheungting-db
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zsxwing
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Which Delta project/connector is this regarding?
Description
This PR fixes a bug that happens when collecting the column attributes specified inside Delta statistic column table property.
The Delta statistic column table property translates all columns' name into lower case while table schema keep the case of each column created by customer. As a result, if there are upper case columns inside table definition, the delta statistic collection would miss these columns.
This PR fixes this issue by translating the column name to lower case while searching statistic columns.
How was this patch tested?
Modify existing test case to cover more column character cases.