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IDS_MON_COLUMN_NOT_DEFINED
IDS_MON_COLUMN_NOT_DEFINED points to property resolution in the query schema. In Windows Search, selected columns must be valid property names registered in the property system, and only retrievable properties can be projected by SELECT. A file containing the desired metadata does not automatically make an arbitrary column name legal SQL.
Validate the property identifier before changing crawl scope
- Log the exact property name after alias expansion and quoting.
- Compare system properties with their canonical
System.*names and check whether the property is registered and retrievable. - Separate “column is unknown” from “known column is NULL for this item”; the latter is a normal row value.
The SELECT contract states that a document lacking a requested, valid property returns NULL for that column. Therefore an undefined-column parser error happens earlier and should not be diagnosed by reindexing documents. Query builders commonly produce this error through misspelled canonical names, old custom property mappings, or aliases intended for a different catalog schema.
SELECT property rules · Identifiers · Parser messages
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