Avoid early materialization of ALTREP objects #4210
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LGTM! Do we need any UI-side changes so that the Environment pane reports something reasonable for these objects (when in Grid view)? |
kevinushey
reviewed
Jan 23, 2019
| public: | ||
| bool empty() const { return versionMajor_ != 0; } | ||
| bool empty() const { return versionMajor_ == 0; } |
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Yikes! I guess we weren't ever really exercising this code path before?
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We were not! As far as I can tell this method was never used before.
We just report them as having no size -- the same thing we do for other "don't touch" objects (active bindings, uneval'ed promises, etc.) |
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Gotcha. I think that's fine. |
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Currently, ALTREP objects (new in R 3.5.0) are fully materialized by RStudio's environment pane, since it calls
object.size()on them. This change protects these objects from premature evaluation by avoiding the environment pane's size/length inspection on objects with thealtflag set (indicating an ALTREP).Note that this does not protect the objects from any type of materialization at all; the first few elements will still be materialized by
str(), which we continue to call.Fixes #4171.