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https://issues.apache.org/jira/browse/PIG-393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627782#action_12627782
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Alan Gates commented on PIG-393:
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I agree that if we were going to start over from scratch it would be better to
use {} for a map and [] for a bag. But we have users out there using pig as
is, and possibly writing post-pig parsers to deal with data. So I don't want
to change our current output unless we have to.
> notations for data bag and data map are confusing
> -------------------------------------------------
>
> Key: PIG-393
> URL: https://issues.apache.org/jira/browse/PIG-393
> Project: Pig
> Issue Type: Wish
> Reporter: Rong-En Fan
> Priority: Minor
>
> In Pig document, we use {} for data bag and [] for data map. While data bag
> is more like a collection (a list of other data) and data map is like a hash,
> their corresponding notation in other language like python (and hash in
> perl), is actually the other way around. In Python, they use [] for list and
> {} for map (dictionary). In perl, they use {} for hash, too. The notations in
> Pig is very confusing for developers who are familiar with Python/perl.
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