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Comment: add link to config in Change Types

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Missing values are represented by the special value NULL. To import data with NULL fields, check documentation of the SerDe used by the table. (The default Text Format uses LazySimpleSerDe which interprets the string \N as NULL when importing.)

Change Types

When hive.metastore.disallow.incompatible.col.type.changes is set to false, the types of columns in Metastore can be changed from any type to any other type.   After such a type change, if the data can be shown correctly with the new type, the data will be displayed.   Otherwise, the data will be displayed as NULL.

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