Queries on MapR-DB JSON tables fail with UnsupportedOperationException: Getting number of rows for tablet not supported

$ mapr dbshell 
MapR-DB Shell
maprdb root:> create /tmp/t1
Table /tmp/t1 created.

maprdb root:> insert /tmp/t1 --id '1' --v '{"a":1}'
Document with id: "1" inserted.

maprdb root:> find /tmp/t1
{"_id":"1","a":1}
1 document(s) found.

> select * from mfs.`/tmp/t1`;
Error: SYSTEM ERROR: UnsupportedOperationException: Getting number of rows for tablet not supported

  (org.apache.drill.exec.work.foreman.ForemanException) Unexpected exception during fragment initialization: Error while applying rule DrillTableRule, args [rel#1400499:EnumerableTableScan.ENUMERABLE.ANY([]).[](table=[mfs, /tmp/t1])]
    org.apache.drill.exec.work.foreman.Foreman.run():300
    java.util.concurrent.ThreadPoolExecutor.runWorker():1149
    java.util.concurrent.ThreadPoolExecutor$Worker.run():624
    java.lang.Thread.run():748
  Caused By (java.lang.RuntimeException) Error while applying rule DrillTableRule, args [rel#1400499:EnumerableTableScan.ENUMERABLE.ANY([]).[](table=[mfs, /tmp/t1])]
    org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch():236
    org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp():648
    org.apache.calcite.tools.Programs$RuleSetProgram.run():339
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform():425
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform():365
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToRawDrel():252
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel():314
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.getPlan():179
    org.apache.drill.exec.planner.sql.DrillSqlWorker.getQueryPlan():145
    org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan():83
    org.apache.drill.exec.work.foreman.Foreman.runSQL():584
    org.apache.drill.exec.work.foreman.Foreman.run():272
    java.util.concurrent.ThreadPoolExecutor.runWorker():1149
    java.util.concurrent.ThreadPoolExecutor$Worker.run():624
    java.lang.Thread.run():748
  Caused By (org.apache.drill.common.exceptions.DrillRuntimeException) Error getting region info for table: maprfs:///tmp/t1
    org.apache.drill.exec.store.mapr.db.json.JsonTableGroupScan.init():161
    org.apache.drill.exec.store.mapr.db.json.JsonTableGroupScan.<init>():83
    org.apache.drill.exec.store.mapr.db.MapRDBFormatPlugin.getGroupScan():81
    org.apache.drill.exec.store.dfs.FileSystemPlugin.getPhysicalScan():170
    org.apache.drill.exec.store.AbstractStoragePlugin.getPhysicalScan():117
    org.apache.drill.exec.store.AbstractStoragePlugin.getPhysicalScan():112
    org.apache.drill.exec.planner.logical.DrillTable.getGroupScan():99
    org.apache.drill.exec.planner.logical.DrillScanRel.<init>():90
    org.apache.drill.exec.planner.logical.DrillScanRel.<init>():70
    org.apache.drill.exec.planner.logical.DrillScanRel.<init>():63
    org.apache.drill.exec.planner.logical.DrillScanRule.onMatch():38
    org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch():212
    org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp():648
    org.apache.calcite.tools.Programs$RuleSetProgram.run():339
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform():425
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform():365
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToRawDrel():252
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel():314
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.getPlan():179
    org.apache.drill.exec.planner.sql.DrillSqlWorker.getQueryPlan():145
    org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan():83
    org.apache.drill.exec.work.foreman.Foreman.runSQL():584
    org.apache.drill.exec.work.foreman.Foreman.run():272
    java.util.concurrent.ThreadPoolExecutor.runWorker():1149
    java.util.concurrent.ThreadPoolExecutor$Worker.run():624
    java.lang.Thread.run():748
  Caused By (java.lang.UnsupportedOperationException) Getting number of rows for tablet not supported
    com.mapr.db.impl.TabletInfoImpl.getEstimatedNumRows():71
    org.apache.drill.exec.store.mapr.db.json.JsonTableGroupScan.init():155
    org.apache.drill.exec.store.mapr.db.json.JsonTableGroupScan.<init>():83
    org.apache.drill.exec.store.mapr.db.MapRDBFormatPlugin.getGroupScan():81
    org.apache.drill.exec.store.dfs.FileSystemPlugin.getPhysicalScan():170
    org.apache.drill.exec.store.AbstractStoragePlugin.getPhysicalScan():117
    org.apache.drill.exec.store.AbstractStoragePlugin.getPhysicalScan():112
    org.apache.drill.exec.planner.logical.DrillTable.getGroupScan():99
    org.apache.drill.exec.planner.logical.DrillScanRel.<init>():90
    org.apache.drill.exec.planner.logical.DrillScanRel.<init>():70
    org.apache.drill.exec.planner.logical.DrillScanRel.<init>():63
    org.apache.drill.exec.planner.logical.DrillScanRule.onMatch():38
    org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch():212
    org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp():648
    org.apache.calcite.tools.Programs$RuleSetProgram.run():339
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform():425
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform():365
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToRawDrel():252
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel():314
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.getPlan():179
    org.apache.drill.exec.planner.sql.DrillSqlWorker.getQueryPlan():145
    org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan():83
    org.apache.drill.exec.work.foreman.Foreman.runSQL():584
    org.apache.drill.exec.work.foreman.Foreman.run():272
    java.util.concurrent.ThreadPoolExecutor.runWorker():1149
    java.util.concurrent.ThreadPoolExecutor$Worker.run():624
    java.lang.Thread.run():748 (state=,code=0)