I have a CSV file of over 30 GB, and I want to load and store it into a DolphinDB database using the loadTextEx
function. The file contains a column named “date” which is stored as INT type, with values like “20230731”. I would like to convert the column into the DATE type (i.e., 2023.07.31). How can I do this?
How to convert date column from INT to DATE type in large CSV files?
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You can define a UDF where the function temporalParse can be applied to convert data types, and then pass this UDF to the transform parameter in
loadTextEx
. Here is an example: