Hi, I am getting strange NPEs using Calcite 1.15 (snapshot) like this: java.lang.NullPointerException
at org.apache.calcite.prepare.PlannerImpl.rootSchema(PlannerImpl.java:312) at org.apache.calcite.prepare.PlannerImpl.createCatalogReader(PlannerImpl.java:291) at org.apache.calcite.prepare.PlannerImpl.validate(PlannerImpl.java:187) at herddb.sql.CalcitePlanner.runPlanner(CalcitePlanner.java:346) I am creating a rootSchema like this: final SchemaPlus _rootSchema = Frameworks.createRootSchema(true); then popuplate with subschematas: for (String mySchema : mySchematas) { SchemaPlus schema = _rootSchema.add(mySchema, new AbstractSchema()); ....popuplate schema } then this rootSchema is considered immutable, no changes from the application There are concurrent calls to code like this: SchemaPlus subSchema = schema.getSubSchema(defaultTableSpace); final FrameworkConfig config = Frameworks.newConfigBuilder() ..... .defaultSchema(subSchema) ....... .build(); Planner planner = Frameworks.getPlanner(config); SqlNode n = planner.parse(query); n = planner.validate(n); I am not able to reproduce the issue systematically, it happens on system tests But after the first error every other call fails with that NPE, so it sounds like a broken cache o inconsistent status Does any ring bell ? Have you have seen concurrency issues in AbstractCached ? I will be back with a reproducer as soon as possible. I see that the 1.15 is still open so maybe I am able to demostrate a real issue maybe we are in time for a last minute fix Thanks Enrico