thisisnic commented on a change in pull request #78:
URL: https://github.com/apache/arrow-cookbook/pull/78#discussion_r720685283
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File path: r/content/tables.Rmd
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@@ -0,0 +1,251 @@
+# Manipulating Data - Tables
+
+__What you should know before you begin__
+
+When you call dplyr verbs from Arrow, behind the scenes this generates
+instructions which tell Arrow how to manipulate the data in the way you've
+specified. These instructions are called _expressions_. Until you pull the
+data back into R, expressions don't do any work to actually retrieve or
+manipulate any data. This is known as _lazy evaluation_ and means that you can
+build up complex expressions that perform multiple actions, and are
efficiently
+evaluated all at once when you retrieve the data. It also means that you are
+able to manipulate data that is larger than
+you can fit into memory on the machine you're running your code on, if you
only
+pull data into R when you have selected the desired subset.
Review comment:
Good to know! I'm going to leave it as is then, as the first complete
version of the cookbook will be associated with 6.0.0, and the comment is
fairly high-level.
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