private Expression analyseAskClause(AAskQueryStart node) {
try {
super.caseAAskQueryStart(node);
VariableCollector variableCollector = new AttributeCollectorImpl();
WhereAnalyser analyzer = analyseWhereClause(node.getWhereClause(), variableCollector);
return new Ask(analyzer.getExpression(), variableCollector);
} catch (ParserException e) {
exception = e;
return null;
}
}