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ZQL is a simple structured query language that allows you to string together the right fields to search using specific values with the appropriate operators and keywords. The text box allows auto-completion making it easy to construct a query. With the cursor in the search box, select the spacebar on your keyboard to be shown a list of fields, operators, keywords and values.

For example, if you are looking for all the test executions with a specific execution status in the 'SM Portfolio' project, you would enter a query that looked like this:
project="SM Portfolio Project" and executionStatus=PASS

Here, the project and executionStatus are fields, SM Portfolio Project and PASS are the values, joined together by the keyword 'and' with the operator =

List of Fields
assignee
component
creationDate
cycleName
executedBy
execution
executionDate
executionDefectKey
executionStatus
fixVersion
folderName
issue
label
priority
project

List of Operators
=
!=
<=
>=
>
<
is not
is
not in
in

List of Keyword
AND
OR
NOT
ORDER BY

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