Upgrade rule to suggest to rename max_threads to parsing_processes #14913
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This adds an upgrade rule as described in #12672 to rename the max_threads configuration to parsing_processes.
I created this rule on the example of the
LoggingConfigurationRule, which doesn't suggest any changes if the old configuration exists but has the default value. I assume, that the idea behind this is, that if the configuration is not set by the user, a default configuration is taken. However, if a user explicitly copied the default configuration in his or her own configuration, in my opinion, a change should be suggested but isn't. But maybe I misunderstood something.