May ASF board report

[Jim Apple <jb...@apache.org>]

Hello, all! I have posted the following report for the ASF board. Please
LMK if there's anything you'd like to add or change.

## Description:
The mission of Apache Impala is the creation and maintenance of software
related to a high-performance distributed SQL engine

## Issues:
There are no issues requiring board attention.

## Membership Data:
Apache Impala was founded 2017-11-14 (2 years ago) There are currently 51
committers and 33 PMC members in this project. The Committer-to-PMC ratio is
roughly 3:2.

Community changes, past quarter:
- Csaba Ringhofer was added to the PMC on 2020-02-18
- Norbert Luksa was added as committer on 2020-04-09

## Project Activity:

 - Support for Apache Hudi tables
 - 3.4.0 release and move of HEAD to 4.0, allowing breaking changes to land
 - Fix numerous flaky tests caused by races, including many found using
   ThreadSanitizer.
 - Improvements to interoperability (or interoperability documentation) with
   many Apache projects, including Parquet, Kudu, Ranger, HDFS Ozone, and
ORC
 - Continued significant efforts towards aarch64 support
 - Improvements to zstd read support
 - Reduction in duplicate codegen work by sharing codegen models between
   fragment instances
 - Numerous improvements to Kerberos ergonomics
 - Significant performance improvements via query rewrites as well as work
   sharing of codegen and join builds
 - Support for CentOS 8.1 and Ubuntu 18.04

## Community Health:

Activity on most metrics increased last quarter: dev@ +86%, issues@
+56%, reviews@ +33%, commits +37%.