oak-core/src/main/java/org/apache/jackrabbit/oak/query/ast/FirstImpl.java [84:94]:
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    public void restrict(FilterImpl f, Operator operator, PropertyValue v) {
        if (operator == Operator.NOT_EQUAL && v != null) {
            // not supported
            return;
        }
        String fn = getFunction(f.getSelector());
        if (fn != null) {
            f.restrictProperty(QueryConstants.FUNCTION_RESTRICTION_PREFIX + fn,
                    operator, v, PropertyType.STRING);
        }
    }
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oak-core/src/main/java/org/apache/jackrabbit/oak/query/ast/CoalesceImpl.java [84:94]:
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    public void restrict(FilterImpl f, Operator operator, PropertyValue v) {
        if (operator == Operator.NOT_EQUAL && v != null) {
            // not supported
            return;
        }
        String fn = getFunction(f.getSelector());
        if (fn != null) {
            f.restrictProperty(QueryConstants.FUNCTION_RESTRICTION_PREFIX + fn,
                    operator, v, PropertyType.STRING);
        }
    }
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