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• subquery ( Mandatory), it can have any valid JQL clause.
  
• link type (Optional), 
• link versus (Optional), it can have O (outward link type) and I (inward link type).

Examples

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Searching issues blocked by linked issues in a state not equal to Done

Assuming you have the following Issue Linking settings

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and the following Mapping

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The issues that are blocked by issues in a state not equal to Done, you could usecan be searched by running the following search:

issue in hqlLinkedIssuesOf("status!=done", "BlockersBlocks", "O")

The JQL function will research all issues linking to any issue not having status equal to done and having link equal to blocks.

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