subqueryflattening.out

derby database source code.good for you.

				open time (milliseconds) = 0
				next time (milliseconds) = 0
				close time (milliseconds) = 0
				restriction time (milliseconds) = 0
				projection time (milliseconds) = 0
			Source result set:
				Table Scan ResultSet for OUTER1 at serializable isolation level using share table locking chosen by the optimizer
				Number of opens = 1
				Rows seen = 2
				Rows filtered = 0
				Fetch Size = 16
					constructor time (milliseconds) = 0
					open time (milliseconds) = 0
					next time (milliseconds) = 0
					close time (milliseconds) = 0
					next time in milliseconds/row = 0
				scan information: 
					Bit set of columns fetched=All
					Number of columns fetched=3
					Number of pages visited=1
					Number of rows qualified=2
					Number of rows visited=2
					Scan type=heap
					start position: 
null					stop position: 
null					qualifiers:
None
	Right result set:
		Index Scan ResultSet for IDX1 using index IDX1_1 at serializable isolation level using share row locking chosen by the optimizer
		Number of opens = 1
		Rows seen = 1
		Rows filtered = 0
		Fetch Size = 1
			constructor time (milliseconds) = 0
			open time (milliseconds) = 0
			next time (milliseconds) = 0
			close time (milliseconds) = 0
			next time in milliseconds/row = 0
		scan information: 
			Bit set of columns fetched={0}
			Number of columns fetched=1
			Number of deleted rows visited=0
			Number of pages visited=1
			Number of rows qualified=1
			Number of rows visited=1
			Scan type=btree
			Tree height=1
			start position: 
	>= on first 1 column(s).
	Ordered null semantics on the following columns: 
			stop position: 
	> on first 1 column(s).
	Ordered null semantics on the following columns: 
			qualifiers:
None
ij> -- multilevel subqueries
-- flatten all
select * from outer1 o where exists
    (select * from idx2 i where exists
        (select * from idx1 ii 
         where o.c1 = i.c1 and i.c2 = ii.c1 and i.c2 = 1));
C1         |C2         |C3         
-----------------------------------
1          |2          |3          
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name: 
	null
Statement Text: 
	-- multilevel subqueries
-- flatten all
select * from outer1 o where exists
    (select * from idx2 i where exists
        (select * from idx1 ii 
         where o.c1 = i.c1 and i.c2 = ii.c1 and i.c2 = 1))
Parse Time: 0
Bind Time: 0
Optimize Time: 0
Generate Time: 0
Compile Time: 0
Execute Time: 0
Begin Compilation Timestamp : null
End Compilation Timestamp : null
Begin Execution Timestamp : null
End Execution Timestamp : null
Statement Execution Plan Text: 
Project-Restrict ResultSet (6):
Number of opens = 1
Rows seen = 1
Rows filtered = 0
restriction = false
projection = true
	constructor time (milliseconds) = 0
	open time (milliseconds) = 0
	next time (milliseconds) = 0
	close time (milliseconds) = 0
	restriction time (milliseconds) = 0
	projection time (milliseconds) = 0
Source result set:
	Nested Loop Exists Join ResultSet:
	Number of opens = 1
	Rows seen from the left = 1
	Rows seen from the right = 1
	Rows filtered = 0
	Rows returned = 1
		constructor time (milliseconds) = 0
		open time (milliseconds) = 0
		next time (milliseconds) = 0
		close time (milliseconds) = 0
	Left result set:
		Nested Loop Join ResultSet:
		Number of opens = 1
		Rows seen from the left = 1
		Rows seen from the right = 1
		Rows filtered = 0
		Rows returned = 1
			constructor time (milliseconds) = 0
			open time (milliseconds) = 0
			next time (milliseconds) = 0
			close time (milliseconds) = 0
		Left result set:
			Index Scan ResultSet for IDX2 using index IDX2_1 at serializable isolation level using share table locking chosen by the optimizer
			Number of opens = 1
			Rows seen = 1
			Rows filtered = 0
			Fetch Size = 16
				constructor time (milliseconds) = 0
				open time (milliseconds) = 0
				next time (milliseconds) = 0
				close time (milliseconds) = 0
				next time in milliseconds/row = 0
			scan information: 
				Bit set of columns fetched={0, 1}
				Number of columns fetched=2
				Number of deleted rows visited=0
				Number of pages visited=1
				Number of rows qualified=1
				Number of rows visited=2
				Scan type=btree
				Tree height=1
				start position: 
	None
				stop position: 
	None
				qualifiers:
Column[0][0] Id: 1
Operator: =
Ordered nulls: false
Unknown return value: false
Negate comparison result: false
		Right result set:
			Table Scan ResultSet for OUTER1 at serializable isolation level using share table locking chosen by the optimizer
			Number of opens = 1
			Rows seen = 1
			Rows filtered = 0
			Fetch Size = 16
				constructor time (milliseconds) = 0
				open time (milliseconds) = 0
				next time (milliseconds) = 0
				close time (milliseconds) = 0
				next time in milliseconds/row = 0
			scan information: 
				Bit set of columns fetched=All
				Number of columns fetched=3
				Number of pages visited=1
				Number of rows qualified=1
				Number of rows visited=2
				Scan type=heap
				start position: 
null				stop position: 
null				qualifiers:
Column[0][0] Id: 0
Operator: =
Ordered nulls: false
Unknown return value: false
Negate comparison result: false
	Right result set:
		Index Scan ResultSet for IDX1 using index IDX1_1 at serializable isolation level using share row locking chosen by the optimizer
		Number of opens = 1
		Rows seen = 1
		Rows filtered = 0
		Fetch Size = 1
			constructor time (milliseconds) = 0
			open time (milliseconds) = 0
			next time (milliseconds) = 0
			close time (milliseconds) = 0
			next time in milliseconds/row = 0
		scan information: 
			Bit set of columns fetched={0}
			Number of columns fetched=1
			Number of deleted rows visited=0
			Number of pages visited=1
			Number of rows qualified=1
			Number of rows visited=1
			Scan type=btree
			Tree height=1
			start position: 
	>= on first 1 column(s).
	Ordered null semantics on the following columns: 
			stop position: 
	> on first 1 column(s).
	Ordered null semantics on the following columns: 
			qualifiers:
None
ij> -- only flatten bottom
select * from outer1 o where exists
    (select * from idx2 i where exists
        (select * from idx1 ii 
         where o.c1 = i.c1 and i.c2 = ii.c1));
C1         |C2         |C3         
-----------------------------------
1          |2          |3          
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name: 
	null
Statement Text: 
	-- only flatten bottom
select * from outer1 o where exists
    (select * from idx2 i where exists
        (select * from idx1 ii 
         where o.c1 = i.c1 and i.c2 = ii.c1))
Parse Time: 0
Bind Time: 0
Optimize Time: 0
Generate Time: 0
Compile Time: 0
Execute Time: 0
Begin Compilation Timestamp : null
End Compilation Timestamp : null
Begin Execution Timestamp : null
End Execution Timestamp : null
Statement Execution Plan Text: 
Attached subqueries:
	Begin Subquery Number 0
	Any ResultSet  (Attached to 2):
	Number of opens = 2
	Rows seen = 2
		constructor time (milliseconds) = 0
		open time (milliseconds) = 0
		next time (milliseconds) = 0
		close time (milliseconds) = 0
	Source result set:
		Project-Restrict ResultSet (6):
		Number of opens = 2
		Rows seen = 1
		Rows filtered = 0
		restriction = false
		projection = true
			constructor time (milliseconds) = 0
			open time (milliseconds) = 0
			next time (milliseconds) = 0
			close time (milliseconds) = 0
			restriction time (milliseconds) = 0
			projection time (milliseconds) = 0
		Source result set:
			Nested Loop Exists Join ResultSet:
			Number of opens = 2
			Rows seen from the left = 1
			Rows seen from the right = 1
			Rows filtered = 0
			Rows returned = 1
				constructor time (milliseconds) = 0
				open time (milliseconds) = 0
				next time (milliseconds) = 0
				close time (milliseconds) = 0
			Left result set:
				Hash Scan ResultSet for IDX2 using index IDX2_1 at serializable isolation level using share table locking: 
				Number of opens = 2
				Hash table size = 1
				Hash key is column number 0
				Rows seen = 1
				Rows filtered = 0
					constructor time