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https://issues.apache.org/jira/browse/ASTERIXDB-1688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steven Jacobs updated ASTERIXDB-1688:
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Description:
Functions for random numbers would be useful for a variety of purposes. The
issue with them versus other functions is the need for keeping track of and
differentiating seed values between calls to the function between queries. A
first strike at this problem could likely allow for just one seed per function
call, while improvements could possibly allow for multiple calls in the same
query to use different seed values entirely.
Note: We should make sure that any random number function is classified as a
nonPure function (i.e. isFunctional should be false)
was:Functions for random numbers would be useful for a variety of purposes.
The issue with them versus other functions is the need for keeping track of
and differentiating seed values between calls to the function between queries.
A first strike at this problem could likely allow for just one seed per
function call, while improvements could possibly allow for multiple calls in
the same query to use different seed values entirely.
> Functions for Random numbers
> ----------------------------
>
> Key: ASTERIXDB-1688
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-1688
> Project: Apache AsterixDB
> Issue Type: New Feature
> Components: AsterixDB, Functions - AQL
> Reporter: Michael J. Carey
> Priority: Minor
>
> Functions for random numbers would be useful for a variety of purposes. The
> issue with them versus other functions is the need for keeping track of and
> differentiating seed values between calls to the function between queries. A
> first strike at this problem could likely allow for just one seed per
> function call, while improvements could possibly allow for multiple calls in
> the same query to use different seed values entirely.
> Note: We should make sure that any random number function is classified as a
> nonPure function (i.e. isFunctional should be false)
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