Table.TransformColumnTypes - Identifying which transformation functions are used

[bgribaudo]

No description provided.

[prmerger-automator]

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[v-dirichards]

@DougKlopfenstein

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

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[ehrenMSFT]

Consider adding "normally" below, because there are a few, ultra-obscure edge cases where that's not the case, but I don't think it's worth enumerating them.

Suggested change

	For each column in `typeTransformations`, the ".From" method corresponding to the specified type value is used to perform the transformation. For example, if a type value of `Currency.Type` is given for a column, the transformation function `Currency.From` will be applied to each value in that column.
	For each column in `typeTransformations`, the ".From" method corresponding to the specified type value is normally used to perform the transformation. For example, if a type value of `Currency.Type` is given for a column, the transformation function `Currency.From` will be applied to each value in that column.

[bgribaudo]

Thanks, @ehrenMSFT! How does it look now?

[prmerger-automator]

@bgribaudo : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 620b162:

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[bgribaudo]

@ehrenMSFT, you have me curious. Even though documenting them doesn't belong on this page, any chance you'd be willing to share the edge cases where the corresponding .From function isn't used? :-)

[ehrenMSFT]

@ehrenMSFT, you have me curious. Even though documenting them doesn't belong on this page, any chance you'd be willing to share the edge cases where the corresponding .From function isn't used? :-)

I don't know much about the scenario, but there are cases where the presence of certain metadata on the column type indicates that a number value comes from the Windows filesystem. In that case, we call DateTime/DateTimeZone.FromFileTime instead of From.

There are also cases where, based on a flag, we can convert to list or record using an "as" operation. But this seems to only be used internally in the JSON library.

[learn-build-service-prod]

Learn Build status updates of commit d1fe95c:

✅ Validation status: passed

File	Status	Preview URL	Details
query-languages/m/table-transformcolumntypes.md	✅Succeeded

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[v-dirichards]

@DougKlopfenstein - Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

[DougKlopfenstein]

#sign-off

[bgribaudo]

@ehrenMSFT, you have me curious. Even though documenting them doesn't belong on this page, any chance you'd be willing to share the edge cases where the corresponding .From function isn't used? :-)

I don't know much about the scenario, but there are cases where the presence of certain metadata on the column type indicates that a number value comes from the Windows filesystem. In that case, we call DateTime/DateTimeZone.FromFileTime instead of From.

There are also cases where, based on a flag, we can convert to list or record using an "as" operation. But this seems to only be used internally in the JSON library.

Thanks, @ehrenMSFT!