v.1.1.54362New Feature

Reading null as Default Value for External Dictionary with MongoDB Source

Official CH changelog text
Reading null as the default value when loading data for an external dictionary with the MongoDB source (Pavel Litvinenko).
ClickHouse now supports reading null as the default value when loading data for an external dictionary from a MongoDB source.

Why it matters

This feature addresses the issue where external dictionaries sourced from MongoDB could not properly handle null values. By reading null as the default, it ensures that dictionaries better reflect the underlying data, preventing errors or incorrect default value usage.

How to use it

When using an external dictionary with the MongoDB source, null values in the source data will automatically be interpreted as default values. No additional configuration is required to enable this behavior.
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