Nate McCall updated CASSANDRA-7622:
    Comment: was deleted

(was: Github user zznate commented on a diff in the pull request:

    --- Diff: src/java/org/apache/cassandra/db/virtual/TableStats.java ---
    @@ -0,0 +1,166 @@
    +package org.apache.cassandra.db.virtual;
    +import java.lang.reflect.Field;
    +import java.lang.reflect.Modifier;
    +import java.nio.ByteBuffer;
    +import java.util.*;
    +import org.apache.cassandra.cql3.CQL3Type;
    +import org.apache.cassandra.cql3.QueryOptions;
    +import org.apache.cassandra.cql3.restrictions.StatementRestrictions;
    +import org.apache.cassandra.db.ColumnFamilyStore;
    +import org.apache.cassandra.db.InMemoryVirtualTable;
    +import org.apache.cassandra.db.marshal.CompositeType;
    +import org.apache.cassandra.metrics.LatencyMetrics;
    +import org.apache.cassandra.schema.TableMetadata;
    +import org.apache.cassandra.utils.EstimatedHistogram;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +import com.codahale.metrics.Counting;
    +import com.codahale.metrics.Gauge;
    +import com.codahale.metrics.Metric;
    +import com.codahale.metrics.Sampling;
    +import com.codahale.metrics.Snapshot;
    +import com.codahale.metrics.Timer;
    +import com.google.common.collect.ImmutableSet;
    +public class TableStats extends InMemoryVirtualTable
    +    private static final Logger logger = 
    +    private static final Field[] FIELDS = 
    +    static
    +    {
    +        Arrays.sort(FIELDS, Comparator.comparing(Field::getName));
    +    }
    +    private static final Collection<String> EH_GAUGES = ImmutableSet.of(
    +            "estimatedPartitionSizeHistogram",
    +            "estimatedColumnCountHistogram");
    +    private CompositeType keyType;
    +    public static Map<String, CQL3Type> columns()
    --- End diff --
    same as above. Initialize statically. 

> Implement virtual tables
> ------------------------
>                 Key: CASSANDRA-7622
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7622
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Tupshin Harper
>            Assignee: Chris Lohfink
>            Priority: Major
>             Fix For: 4.x
> There are a variety of reasons to want virtual tables, which would be any 
> table that would be backed by an API, rather than data explicitly managed and 
> stored as sstables.
> One possible use case would be to expose JMX data through CQL as a 
> resurrection of CASSANDRA-3527.
> Another is a more general framework to implement the ability to expose yaml 
> configuration information. So it would be an alternate approach to 
> A possible implementation would be in terms of CASSANDRA-7443, but I am not 
> presupposing.

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