FYI, the output of the voltTable "indexes" is:

 header size: 207
 status code: -128 column count: 13
 cols (TABLE_CAT:STRING), (TABLE_SCHEM:STRING), (TABLE_NAME:STRING), (NON_UNIQUE:TINYINT), (INDEX_QUALIFIER:STRING), (INDEX_NAME:STRING), (TYPE:SMALLINT), (ORDINAL_POSITION:SMALLINT), (COLUMN_NAME:STRING), (ASC_OR_DESC:STRING), (CARDINALITY:INTEGER), (PAGES:INTEGER), (FILTER_CONDITION:STRING), 
 rows -
  NULL,NULL,TABLE1,1,NULL,INDEX1_TREE,3,1,COLUMN2,A,NULL,NULL,NULL
  NULL,NULL,TABLE1,1,NULL,INDEX1_TREE,3,2,COLUMN3,A,NULL,NULL,NULL
  NULL,NULL,TABLE1,1,NULL,INDEX2_HASH,2,1,COLUMN4,NULL,NULL,NULL,NULL
  NULL,NULL,TABLE1,1,NULL,INDEX2_HASH,2,2,COLUMN5,NULL,NULL,NULL,NULL
  NULL,NULL,TABLE1,0,NULL,SYS_IDX_PK_TREE_10019,3,1,COLUMN1,A,NULL,NULL,NULL
  NULL,NULL,TABLE1,0,NULL,SYS_IDX_PK_TREE_10019,3,2,COLUMN3,A,NULL,NULL,NULL
  NULL,NULL,TABLE1,0,NULL,SYS_IDX_SYS_CT_10017_10020,3,1,COLUMN1,A,NULL,NULL,NULL