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156 lines
3.6 KiB
Text
156 lines
3.6 KiB
Text
#
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# check errors
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#
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WITH RECURSIVE cte AS (
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SELECT 1 AS a UNION ALL
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SELECT NULL FROM cte WHERE a IS NOT NULL)
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CYCLE a, a RESTRICT
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SELECT * FROM cte;
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ERROR 42S21: Duplicate column name 'a'
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WITH RECURSIVE cte AS (
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SELECT 1 AS a UNION ALL
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SELECT NULL FROM cte WHERE a IS NOT NULL)
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CYCLE b RESTRICT
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SELECT * FROM cte;
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ERROR 42S22: Unknown column 'b' in 'CYCLE clause'
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WITH cte AS (
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SELECT 1 AS a UNION ALL
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SELECT NULL FROM cte WHERE a IS NOT NULL)
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CYCLE b RESTRICT
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SELECT * FROM cte;
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'CYCLE b RESTRICT
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SELECT * FROM cte' at line 4
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#
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# A degenerate case
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#
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WITH RECURSIVE cte AS (
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SELECT 1 AS a, 2 as b)
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CYCLE b RESTRICT
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SELECT * FROM cte;
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a b
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1 2
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#
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# A simple case
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#
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WITH RECURSIVE cte AS (
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SELECT 1 AS a, 2 as b UNION ALL
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SELECT 2, 2 FROM cte WHERE a IS NOT NULL)
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CYCLE b RESTRICT
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SELECT * FROM cte;
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a b
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1 2
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#
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# MDEV-20632 case (with fixed syntax)
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#
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create table t1 (from_ int, to_ int);
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insert into t1 values (1,2), (1,100), (2,3), (3,4), (4,1);
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WITH RECURSIVE cte (depth, from_, to_) as (
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SELECT 0,1,1
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UNION
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SELECT depth+1, t1.from_, t1.to_
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FROM t1, cte WHERE t1.from_ = cte.to_
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) CYCLE from_, to_ RESTRICT
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select * from cte;
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depth from_ to_
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0 1 1
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1 1 2
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1 1 100
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2 2 3
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3 3 4
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4 4 1
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create view v1 as WITH RECURSIVE cte (depth, from_, to_) as (
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SELECT 0,1,1
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UNION
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SELECT depth+1, t1.from_, t1.to_
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FROM t1, cte WHERE t1.from_ = cte.to_
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) CYCLE from_, to_ RESTRICT
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select * from cte;
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show create view v1;
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View Create View character_set_client collation_connection
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v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS with recursive cte(`depth`,`from_`,`to_`) as (select 0 AS `depth`,1 AS `from_`,1 AS `to_` union select `cte`.`depth` + 1 AS `depth+1`,`t1`.`from_` AS `from_`,`t1`.`to_` AS `to_` from (`t1` join `cte`) where `t1`.`from_` = `cte`.`to_`) CYCLE `from_`,`to_` RESTRICT select `cte`.`depth` AS `depth`,`cte`.`from_` AS `from_`,`cte`.`to_` AS `to_` from `cte` latin1 latin1_swedish_ci
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select * from v1;
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depth from_ to_
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0 1 1
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1 1 2
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1 1 100
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2 2 3
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3 3 4
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4 4 1
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delete from t1;
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insert into t1 values (1,2), (1,NULL), (NULL,NULL), (NULL, 1);
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select * from v1;
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depth from_ to_
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0 1 1
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1 1 2
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1 1 NULL
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drop view v1;
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drop table t1;
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#
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# A simple blob case
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#
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create table t1 (a int, b text);
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insert into t1 values (1, "a");
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WITH RECURSIVE cte AS (
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SELECT a, b from t1 UNION ALL
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SELECT a, b FROM cte WHERE a IS NOT NULL)
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CYCLE b RESTRICT
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SELECT * FROM cte;
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a b
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1 a
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drop table t1;
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#
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# check bit types
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#
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create table t1 (from_ bit(3), to_ bit(3));
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insert into t1 values (1,2), (1,7), (2,3), (3,4), (4,1);
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WITH RECURSIVE cte (depth, from_, to_) as (
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SELECT 0,1,1
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UNION
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SELECT depth+1, t1.from_, t1.to_
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FROM t1, cte WHERE t1.from_ = cte.to_
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) CYCLE from_, to_ RESTRICT
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select * from cte;
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depth from_ to_
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0 1 1
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1 1 2
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1 1 7
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2 2 3
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3 3 4
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4 4 1
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drop table t1;
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#
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# check bit types with BLOBs (TEXT)
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#
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create table t1 (from_ bit(3), to_ bit(3), load_ text);
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insert into t1 values (1,2,"A"), (1,7,"A"), (2,3,"A"), (3,4,"A"), (4,1,"A");
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WITH RECURSIVE cte (depth, from_, to_, load_) as (
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SELECT 0,1,1,"A"
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UNION
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SELECT depth+1, t1.from_, t1.to_, t1.load_
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FROM t1, cte WHERE t1.from_ = cte.to_
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) CYCLE from_, to_, load_ RESTRICT
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select * from cte;
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depth from_ to_ load_
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0 1 1 A
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1 1 2 A
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1 1 7 A
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2 2 3 A
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3 3 4 A
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4 4 1 A
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insert into t1 values (4,1,"B");
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WITH RECURSIVE cte (depth, from_, to_, load_) as (
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SELECT 0,1,1,"A"
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UNION
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SELECT depth+1, t1.from_, t1.to_, t1.load_
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FROM t1, cte WHERE t1.from_ = cte.to_
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) CYCLE from_, to_, load_ RESTRICT
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select * from cte;
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depth from_ to_ load_
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0 1 1 A
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1 1 2 A
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1 1 7 A
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2 2 3 A
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3 3 4 A
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4 4 1 A
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4 4 1 B
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drop table t1;
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