GaussDB A does not support hash indexes. DSC will replace these indexes with normal indexes based on GaussDB features.

1. Inline hash index

   Input

   CREATE TABLE `public`.`test_create_table03` ( 
     `DEMAND_ID` INT(11) NOT NULL AUTO_INCREMENT, 
     `DEMAND_NAME` CHAR(100) NOT NULL, 
     `THEME` VARCHAR(200) NULL DEFAULT NULL, 
     `SEND_ID` INT(11) NULL DEFAULT NULL, 
     `SEND_NAME` CHAR(20) NULL DEFAULT NULL, 
     `SEND_TIME` DATETIME NULL DEFAULT NULL, 
     `DEMAND_CONTENT` TEXT NOT NULL, 
     PRIMARY KEY(`DEMAND_ID`), 
        INDEX CON_INDEX(DEMAND_CONTENT(100)) USING HASH , 
        INDEX SEND_INFO_INDEX USING HASH (SEND_ID,SEND_NAME(10),SEND_TIME) 
    );

   Output

   CREATE TABLE "public"."test_create_table03" 
    ( 
      "demand_id" SERIAL NOT NULL, 
      "demand_name" CHAR(100) NOT NULL, 
      "theme" VARCHAR(200) DEFAULT NULL, 
      "send_id" INTEGER(11) DEFAULT NULL, 
      "send_name" CHAR(20) DEFAULT NULL, 
      "send_time" TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL, 
      "demand_content" TEXT NOT NULL, 
      PRIMARY KEY ("demand_id") 
    ) 
      WITH ( ORIENTATION = ROW, COMPRESSION = NO ) 
      NOCOMPRESS 
      DISTRIBUTE BY HASH ("demand_id"); 
    CREATE INDEX "con_index" ON "public"."test_create_table03" ("demand_content"); 
    CREATE INDEX "send_info_index" ON "public"."test_create_table03" ("send_id","send_name","send_time");

2. Hash index created by ALTER TABLE

   Input

   CREATE TABLE IF NOT EXISTS `public`.`runoob_alter_test`( 
        `dataType1` int NOT NULL AUTO_INCREMENT, 
        `dataType2` FLOAT(10,2), 
        PRIMARY KEY(`dataType1`) 
    )ENGINE=InnoDB DEFAULT CHARSET=utf8; 
     
    ALTER TABLE runoob_alter_test ADD KEY alterTable_addKey_indexType(dataType1) USING HASH;

   Output

   CREATE TABLE "public"."runoob_alter_test" 
    ( 
      "datatype1" SERIAL NOT NULL, 
      "datatype2" FLOAT(10), 
      PRIMARY KEY ("datatype1") 
    ) 
      WITH ( ORIENTATION = ROW, COMPRESSION = NO ) 
      NOCOMPRESS 
      DISTRIBUTE BY HASH ("datatype1"); 
     
    CREATE INDEX "altertable_addkey_indextype" ON "public"."runoob_alter_test" ("datatype1");

3. Hash index created by CREATE INDEX

   Input

   CREATE TABLE `public`.`test_index_table06` ( 
     `ID` INT(11) NOT NULL AUTO_INCREMENT, 
     `FNAME` VARCHAR(30) NOT NULL, 
     `INAME` VARCHAR(30) NOT NULL, 
     PRIMARY KEY (`ID`) 
    ); 
    CREATE INDEX FNAME_INDEX ON TEST_INDEX_TABLE06(FNAME(10)) USING HASH; 
    CREATE INDEX NAME_01 ON TEST_INDEX_TABLE06(FNAME(10),INAME(10)) USING HASH;

   Output

   CREATE TABLE "public"."test_index_table06" 
    ( 
      "id" SERIAL NOT NULL, 
      "fname" VARCHAR(30) NOT NULL, 
      "iname" VARCHAR(30) NOT NULL, 
      PRIMARY KEY ("id") 
    ) 
      WITH ( ORIENTATION = ROW, COMPRESSION = NO ) 
      NOCOMPRESS 
      DISTRIBUTE BY HASH ("id"); 
    CREATE INDEX "fname_index" ON "public"."test_index_table06" ("fname"); 
    CREATE INDEX "name_01" ON "public"."test_index_table06" ("fname","iname");