Function needsStringFiltering

worker/task.go:1205–1220

(srcFn *functionContext, langs []string, attr string)

}

func needsStringFiltering(srcFn *functionContext, langs []string, attr string) bool {
	if !srcFn.isStringFn {
		return false
	}

	// If a predicate doesn't have @lang directive in schema, we don't need to do any string
	// filtering.
	if !schema.State().HasLang(attr) {
		return false
	}

	return langForFunc(langs) != "." &&
		(srcFn.fnType == standardFn || srcFn.fnType == hasFn ||
			srcFn.fnType == fullTextSearchFn || srcFn.fnType == compareAttrFn ||
			srcFn.fnType == customIndexFn || srcFn.fnType == ngramFn)
}

func (qs *queryState) handleCompareScalarFunction(ctx context.Context, arg funcArgs) error {
	attr := arg.q.Attr