diff options
Diffstat (limited to 'lib/stdlib/doc')
| -rw-r--r-- | lib/stdlib/doc/src/ets.xml | 15 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/notes.xml | 15 |
2 files changed, 30 insertions, 0 deletions
diff --git a/lib/stdlib/doc/src/ets.xml b/lib/stdlib/doc/src/ets.xml index ccccf7de88..622edc072e 100644 --- a/lib/stdlib/doc/src/ets.xml +++ b/lib/stdlib/doc/src/ets.xml @@ -188,6 +188,21 @@ is used to keep the table fixated during the entire traversal.</p> </item> </list> + <p>Traversals using <c>match</c> and <c>select</c> functions may not need to + scan the entire table depending on how the key is specified. A match + pattern with a <em>fully bound key</em> (without any match variables) will + optimize the operation to a single key lookup without any table traversal + at all. For <c>ordered_set</c> a <em>partially bound key</em> will limit the + traversal to only scan a subset of the table based on term order. A + partially bound key is either a list or a tuple with a prefix that is fully + bound. Example:</p> +<pre> +1> <input>T = ets:new(t,[ordered_set]), ets:insert(T, {"555-1234", "John Smith"}).</input> +true +2> <input>%% Efficient search of all with area code 555</input> +2> <input>ets:match(T,{[$5,$5,$5,$- |'$1'],'$2'}).</input> +[["1234","John Smith"]] +</pre> </section> <section> diff --git a/lib/stdlib/doc/src/notes.xml b/lib/stdlib/doc/src/notes.xml index 7ba19a98ea..993945b9c7 100644 --- a/lib/stdlib/doc/src/notes.xml +++ b/lib/stdlib/doc/src/notes.xml @@ -31,6 +31,21 @@ </header> <p>This document describes the changes made to the STDLIB application.</p> +<section><title>STDLIB 3.7.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> Optimize pretty printing of terms. The slower + behaviour was introduced in Erlang/OTP 20. </p> + <p> + Own Id: OTP-15573 Aux Id: ERIERL-306 </p> + </item> + </list> + </section> + +</section> + <section><title>STDLIB 3.7</title> <section><title>Fixed Bugs and Malfunctions</title> |