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The crawler is making a guess, if you use a different delimiter and commas without quotes, then it cannot be sure what is right.
Assuming your csv is valid, you can correct manually the table created by the crawler, as long as you don't run it again (or you run it only to update partitions).
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Please check the detail CSV Classifer: Adding classifiers to a crawler in AWS Glue - Built-in CSV classifier - https://docs.aws.amazon.com/glue/latest/dg/add-classifier.html#classifier-builtin-rules
The built-in CSV classifier parses CSV file contents to determine the schema for an AWS Glue table. This classifier checks for the following delimiters: Comma (,) Pipe (|) Tab (\t) Semicolon (;) Ctrl-A (\u0001) Ctrl-A is the Unicode control character for Start Of Heading.
a. So in your case you can't use comma as delimiter else it will split into column. b. If your columns are not delimited by column, then you can use custom classifier with the different of the file. c. But, if you have comma delimited files and dont want to split specific value, then you are left out with writing Grok custom classifier. [] Writing custom classifiers - https://docs.aws.amazon.com/glue/latest/dg/custom-classifier.html