[native] Convert input field names to lower case in plan conversion #21265
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presto-native-execution/presto_cpp/main/types/PrestoToVeloxQueryPlan.cpp
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Presto is case insensitive, and so always converts column names and field names to lower case in its plan. When Presto constructs the Velox query plan it passes in the types for Hive tables as they were read from the metastore, with capital letters if they were there in the metastore. Velox uses these types to construct the output type of the TableScan. This leads to errors as the output of the TableScan will have capital letters in field names, while field accesses in the rest of the plan will use the field names Presto used in its original plan, which are all lower case. Converting the field names from the types in the input Hive tables to lower case fixes this inconsistency.
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Presto is case insensitive, and so always converts column names and field names to lower case in its plan.
When Presto constructs the Velox query plan it passes in the types for Hive tables as they were read from the metastore, with capital letters if they were there in the metastore. Velox uses these types to construct the output type of the TableScan.
This leads to errors as the output of the TableScan will have capital letters in field names, while field accesses in the rest of the plan will use the field names Presto used in its original plan, which are all lower case.
Converting the field names from the types in the input Hive tables to lower case fixes this inconsistency.