ARROW-314: JSONScalar is unnecessary and unused
ARROW-314: JSONScalar is unnecessary and unused

Author: Julien Le Dem <julien@dremio.com>

Closes #153 from julienledem/jsonscalar and squashes the following commits:

905027c [Julien Le Dem] ARROW-314: JSONScalar is unnecessary and unused

dremio/arrow,StevenMPhillips/arrow,apache/arrow,NonVolatileComputing/arrow,pcmoritz/arrow,renesugar/arrow,jeffknupp/arrow,StevenMPhillips/arrow,tebeka/arrow,apache/arrow,itaiin/arrow,jeffknupp/arrow,pcmoritz/arrow,laurentgo/arrow,laurentgo/arrow,apache/arrow,laurentgo/arrow,StevenMPhillips/arrow,wagavulin/arrow,yufeldman/arrow,icexelloss/arrow,wesm/arrow,cpcloud/arrow,wesm/arrow,julienledem/arrow,xhochy/arrow,renesugar/arrow,cpcloud/arrow,julienledem/arrow,laurentgo/arrow,jeffknupp/arrow,icexelloss/arrow,icexelloss/arrow,itaiin/arrow,StevenMPhillips/arrow,wesm/arrow,wesm/arrow,apache/arrow,wagavulin/arrow,wesm/arrow,xhochy/arrow,majetideepak/arrow,xhochy/arrow,jeffknupp/arrow,kou/arrow,xhochy/arrow,pcmoritz/arrow,xhochy/arrow,dremio/arrow,icexelloss/arrow,cpcloud/arrow,kou/arrow,xhochy/arrow,xhochy/arrow,pcmoritz/arrow,majetideepak/arrow,icexelloss/arrow,xhochy/arrow,siddharthteotia/arrow,tebeka/arrow,apache/arrow,jeffknupp/arrow,itaiin/arrow,wagavulin/arrow,apache/arrow,NonVolatileComputing/arrow,yufeldman/arrow,yufeldman/arrow,kou/arrow,renesugar/arrow,icexelloss/arrow,pcmoritz/arrow,TheNeuralBit/arrow,jeffknupp/arrow,NonVolatileComputing/arrow,StevenMPhillips/arrow,laurentgo/arrow,julienledem/arrow,wagavulin/arrow,renesugar/arrow,icexelloss/arrow,NonVolatileComputing/arrow,majetideepak/arrow,wagavulin/arrow,julienledem/arrow,wesm/arrow,TheNeuralBit/arrow,jeffknupp/arrow,NonVolatileComputing/arrow,pcmoritz/arrow,wagavulin/arrow,itaiin/arrow,apache/arrow,icexelloss/arrow,TheNeuralBit/arrow,dremio/arrow,dremio/arrow,julienledem/arrow,itaiin/arrow,itaiin/arrow,renesugar/arrow,julienledem/arrow,cpcloud/arrow,wesm/arrow,pcmoritz/arrow,itaiin/arrow,cpcloud/arrow,itaiin/arrow,StevenMPhillips/arrow,kou/arrow,majetideepak/arrow,pcmoritz/arrow,icexelloss/arrow,pcmoritz/arrow,kou/arrow,StevenMPhillips/arrow,TheNeuralBit/arrow,renesugar/arrow,wagavulin/arrow,renesugar/arrow,laurentgo/arrow,julienledem/arrow,cpcloud/arrow,wagavulin/arrow,kou/arrow,renesugar/arrow,tebeka/arrow,cpcloud/arrow,icexelloss/arrow,kou/arrow,julienledem/arrow,siddharthteotia/arrow,yufeldman/arrow,renesugar/arrow,kou/arrow,itaiin/arrow,jeffknupp/arrow,majetideepak/arrow,dremio/arrow,pcmoritz/arrow,kou/arrow,tebeka/arrow,jeffknupp/arrow,cpcloud/arrow,laurentgo/arrow,wesm/arrow,itaiin/arrow,apache/arrow,laurentgo/arrow,apache/arrow,NonVolatileComputing/arrow,dremio/arrow,cpcloud/arrow,yufeldman/arrow,xhochy/arrow,pcmoritz/arrow,wagavulin/arrow,renesugar/arrow,cpcloud/arrow,dremio/arrow,cpcloud/arrow,majetideepak/arrow,icexelloss/arrow,majetideepak/arrow,wesm/arrow,siddharthteotia/arrow,renesugar/arrow,majetideepak/arrow,julienledem/arrow,itaiin/arrow,pcmoritz/arrow,pcmoritz/arrow,majetideepak/arrow,cpcloud/arrow,laurentgo/arrow,cpcloud/arrow,kou/arrow,siddharthteotia/arrow,tebeka/arrow,kou/arrow,icexelloss/arrow,yufeldman/arrow,xhochy/arrow,apache/arrow,tebeka/arrow,julienledem/arrow,renesugar/arrow,xhochy/arrow,siddharthteotia/arrow,laurentgo/arrow,wesm/arrow,laurentgo/arrow,wesm/arrow,apache/arrow,majetideepak/arrow,xhochy/arrow,yufeldman/arrow,tebeka/arrow,yufeldman/arrow,majetideepak/arrow,pcmoritz/arrow,cpcloud/arrow,wesm/arrow,wesm/arrow,xhochy/arrow,tebeka/arrow,icexelloss/arrow,itaiin/arrow,dremio/arrow,itaiin/arrow,jeffknupp/arrow,itaiin/arrow,apache/arrow,laurentgo/arrow,majetideepak/arrow,renesugar/arrow,yufeldman/arrow,xhochy/arrow,siddharthteotia/arrow,laurentgo/arrow,apache/arrow,majetideepak/arrow,wesm/arrow,xhochy/arrow,majetideepak/arrow,NonVolatileComputing/arrow,tebeka/arrow,dremio/arrow,TheNeuralBit/arrow,siddharthteotia/arrow,itaiin/arrow,siddharthteotia/arrow,StevenMPhillips/arrow,tebeka/arrow,yufeldman/arrow,wagavulin/arrow,wagavulin/arrow,wagavulin/arrow,laurentgo/arrow,TheNeuralBit/arrow,apache/arrow,NonVolatileComputing/arrow,NonVolatileComputing/arrow,renesugar/arrow,siddharthteotia/arrow,kou/arrow,pcmoritz/arrow,jeffknupp/arrow,NonVolatileComputing/arrow,kou/arrow,siddharthteotia/arrow,renesugar/arrow,kou/arrow,StevenMPhillips/arrow,yufeldman/arrow,siddharthteotia/arrow,NonVolatileComputing/arrow,StevenMPhillips/arrow,dremio/arrow,majetideepak/arrow,icexelloss/arrow,laurentgo/arrow,dremio/arrow