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When using Views Data Export with non-scalar exposed filters (for example, a date field with between operator or a taxonomy select box), a warning is generated during export. The warning occurs even when not using the %exposed-token in a filename, and when using the token, the actual data for those complex filters is missing.
Warning: htmlspecialchars() expects parameter 1 to be string, array given in check_plain() (line 1521 of /home/ivangeer/workspace/zebweb/includes/bootstrap.inc).
Attached is a patch that attempts to resolve this by flattening arrays (seems that this is the only other type besides scalar data).
PASSED: [[SimpleTest]]: [MySQL] 80 pass(es). View
FAILED: [[SimpleTest]]: [MySQL] Unable to apply patch views-data-export-complex-filter-token-warning-d6.patch. Unable to apply patch. See the log in the details link for more information. View
PASSED: [[SimpleTest]]: [MySQL] 78 pass(es). View