I only found a method about cacheing in SchemaPlus [1], but the Schema.contentsHaveChangedSince only appears in the doc, i look up the commits and it seems that this method is gone from very old version [2], maybe Julian can answer your question.
[1] https://github.com/apache/calcite/blob/a648f9c12309cc253628930b0cab98591caa66ab/core/src/main/java/org/apache/calcite/schema/SchemaPlus.java#L85 [2] https://github.com/julianhyde/optiq/issues/175 Best, Danny Chan 在 2019年3月25日 +0800 PM3:11，[email protected]，写道： > > Schema
