[PUP-10113] Functions are slower if called with chained syntax than with prefix syntax - Puppet Tickets

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Release Notes:
Bug Fix
Release Notes Summary:

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The puppet language supports calling functions using prefix or chained syntax, for example, "each($var)" and "$var.each", respectively. Using the latter syntax is now much faster, especially when $var is a large hash, such as $facts from the node.

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The puppet language supports calling functions using prefix or chained syntax, for example, "each($var)" and "$var.each", respectively. Using the latter syntax is now much faster, especially when $var is a large hash, such as $facts from the node.

Puppet Version: 5.5.17
Puppet Server Version: 2018.1
OS Name/Version: Centos 7

Desired Behavior:

As documented in https://puppet.com/docs/puppet/5.5/lang_functions.html#chained-function-calls, chained function call syntax should result in same behaviour as prefixed syntax.

Actual Behavior:

Using chained syntax results in slower performance of the function call. The performance depends on the size of the object "before the dot".

Examples:

Run puppet apply test.pp --debug --profile

Please see attached:

relates to

PUP-9577 Large numbers of facts cause slow performance

PUP-10225 Puppetserver 6 performance regression