Update CreateSchemaQuery.java

[sofiazxy]

When you try to execute the 2 VerdictDB.sql commands back to back : getting the runtime error: org.verdictdb.exception.VerdictDBDbmsException: Issued the following query: create schema verdictdbtemp org.apache.hadoop.hive.metastore.api.AlreadyExistsException: Database verdictdbtemp already exists;

at org.verdictdb.connection.SparkConnection.executeSingle(SparkConnection.java:166)
at org.verdictdb.connection.SparkConnection.execute(SparkConnection.java:148)

at org.verdictdb.connection.CachedDbmsConnection.execute(CachedDbmsConnection.java:49) at org.verdictdb.connection.DbmsConnection.execute(DbmsConnection.java:41) at org.verdictdb.coordinator.SelectQueryCoordinator.process(SelectQueryCoordinator.java:128)

This is because: createSchema does not use IF NOT EXISTS hence causing the error.

Fixed this problem in CreateSchemaQuery() constructor

[codecov-io]

Codecov Report

Merging #355 into master will increase coverage by 0.08%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
+ Coverage    70.9%   70.97%   +0.08%     
==========================================
  Files         168      168              
  Lines       11517    11518       +1     
  Branches     1879     1879              
==========================================
+ Hits         8165     8174       +9     
+ Misses       2868     2862       -6     
+ Partials      484      482       -2

Impacted Files	Coverage Δ
...rg/verdictdb/core/sqlobject/CreateSchemaQuery.java	81.82% <100%> (+1.82%)	:arrow_up:
.../core/scrambling/FastConvergeScramblingMethod.java	89.6% <0%> (+0.58%)	:arrow_up:
...ictdb/core/querying/QueryNodeWithPlaceHolders.java	88.97% <0%> (+0.69%)	:arrow_up:
.../verdictdb/core/execplan/ExecutableNodeRunner.java	84.9% <0%> (+0.82%)	:arrow_up:
...verdictdb/core/querying/ola/InMemoryAggregate.java	86.24% <0%> (+1.45%)	:arrow_up:
...org/verdictdb/connection/CachedDbmsConnection.java	79.37% <0%> (+1.59%)	:arrow_up:

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