public Builder ifNotExists(boolean ifNotExists) {
      this.ifNotExists = ifNotExists;
      return this;
    }
If not exists.

@param ifNotExists If set to true, hive will not throw exception, if a
table with the same name already exists.
@return the builder
hcatalog/webhcat/java-client/src/main/java/org/apache/hive/hcatalog/api/HCatCreateTableDesc.java