Tinyint field cannot be converted to integer

I am using logstash 5.1.1
I ported data from mysql using mysql input plugin to elasticsearch. When I run the pipeline, for the tinyint fields, logstash cannot convert it to integer automatically.
So I used mutation filter and convert to integer

          mutate {
                   convert => {"record_impression" => "integer" }
             }

20:14:00.958 [[main]>worker2] ERROR logstash.pipeline - Exception in pipelineworker, the pipeline stopped processing new events, please check your filter configuration and restart Logstash. {"exception"=>#<NoMethodError: undefined method to_i' for true:TrueClass>, "backtrace"=>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-mutate-3.1.3/lib/logstash/filters/mutate.rb:275:inconvert_integer'", "org/jruby/RubyMethod.java:120:in call'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-mutate-3.1.3/lib/logstash/filters/mutate.rb:258:inconvert'", "org/jruby/RubyHash.java:1342:in each'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-mutate-3.1.3/lib/logstash/filters/mutate.rb:244:inconvert'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-mutate-3.1.3/lib/logstash/filters/mutate.rb:206:in filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:145:indo_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:164:in multi_filter'", "org/jruby/RubyArray.java:1613:ineach'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:161:in multi_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filter_delegator.rb:41:inmulti_filter'", "(eval):93:in filter_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:295:infilter_batch'", "org/jruby/RubyProc.java:281:in call'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:192:ineach'", "org/jruby/RubyHash.java:1342:in each'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:191:ineach'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:294:in filter_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:282:inworker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:258:in start_workers'"]} 20:14:00.966 [[main]>worker0] ERROR logstash.pipeline - Exception in pipelineworker, the pipeline stopped processing new events, please check your filter configuration and restart Logstash. {"exception"=>#<NoMethodError: undefined methodto_i' for false:FalseClass>, "backtrace"=>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-mutate-3.1.3/lib/logstash/filters/mutate.rb:275:in convert_integer'", "org/jruby/RubyMethod.java:120:incall'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-mutate-3.1.3/lib/logstash/filters/mutate.rb:258:in convert'", "org/jruby/RubyHash.java:1342:ineach'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-mutate-3.1.3/lib/logstash/filters/mutate.rb:244:in convert'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-mutate-3.1.3/lib/logstash/filters/mutate.rb:206:infilter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:145:in do_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:164:inmulti_filter'", "org/jruby/RubyArray.java:1613:in each'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:161:inmulti_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filter_delegator.rb:41:in multi_filter'", "(eval):93:infilter_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:295:in filter_batch'", "org/jruby/RubyProc.java:281:incall'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:192:in each'", "org/jruby/RubyHash.java:1342:ineach'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:191:in each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:294:infilter_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:282:in worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:258:instart_workers'"]}

Problem solved. Looks like logstash does not recognize tinyint from mysql, so I converted the field to char type in mysql query, and then in logstash filter, use mutation to convert it to integer. It works.

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