DHFPROD-7301: Fix single column export

Author: ryanjdew

marklogic-data-hub/src/main/resources/ml-modules/root/data-hub/5/data-services/entitySearch/exportSearchAsCSV.sjs

@@ -20,6 +20,8 @@ xdmp.securityAssert("http://marklogic.com/data-hub/hub-central/privileges/export
 const op = require('/MarkLogic/optic');
 const search = require('/MarkLogic/appservices/search/search');
 const entityLib = require("/data-hub/5/impl/entity-lib.sjs");
+const HubUtils = require("/data-hub/5/impl/hub-utils.sjs");
+const hubUtils = new HubUtils();
 const httpUtils = require("/data-hub/5/impl/http-utils.sjs");
 
 const returnFlags = `<return-aggregates xmlns="http://marklogic.com/appservices/search">false</return-aggregates>
@@ -88,7 +90,8 @@ queryOptions = fn.head(xdmp.unquote(queryOptions)).root;
  * Also replacing hyphen with underscore for column names (entity property names), schema names and view names since TDE's do the same.
  */
 const simplePropertySet = filterObjectAndArrayTypeProperties(schemaName);
-columns = columns.toArray().filter(column => simplePropertySet.has(column)).map(column => replaceHyphenWithUnderscore(column));
+// Using Sequence.from
+columns = hubUtils.normalizeToArray(columns).filter(column => simplePropertySet.has(column)).map(column => replaceHyphenWithUnderscore(column));
 viewName = replaceHyphenWithUnderscore(viewName);
 schemaName = replaceHyphenWithUnderscore(schemaName);
 

marklogic-data-hub/src/test/ml-modules/root/test/suites/data-hub/5/data-services/entitySearch/exportSearchAsCSVTest.sjs

@@ -102,13 +102,32 @@ function testPlanWithBadSortOrder() {
     ];
 }
 
+function testPlanWithSingleColumn() {
+    const structuredQuery = xdmp.quote(search.parse(''));
+    let err = null;
+    try {
+        const plan = invokeExportSearchService(
+            'EntitySearchEntity',
+            'EntitySearchEntity', 10,
+            structuredQuery, '',
+            [],
+            'searchEntityProp1');
+    } catch (e) {
+        err = e;
+    }
+    return [
+        test.assertTrue(err === null, `Exception should not be thrown for single column. ${xdmp.describe(err, Sequence.from([]), Sequence.from([]))}`)
+    ];
+}
+
 let assertions = [];
 // Test with hub-central-entity-exporter
 hubTest.runWithRolesAndPrivileges(['hub-central-entity-exporter'], [], function() {
     assertions = []
         .concat(testValidAscendingPlan())
         .concat(testValidDescendingPlan())
-        .concat(testPlanWithBadSortOrder());
+        .concat(testPlanWithBadSortOrder())
+        .concat(testPlanWithSingleColumn());
 });
 
 assertions;