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limit
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# tests adapted from logictest -- limit
exec-ddl
CREATE TABLE t (k INT PRIMARY KEY, v INT, w INT, INDEX(v))
----
build
SELECT k, v FROM t ORDER BY k LIMIT 5
----
limit
├── columns: k:1!null v:2
├── internal-ordering: +1
├── ordering: +1
├── project
│ ├── columns: k:1!null v:2
│ ├── ordering: +1
│ ├── limit hint: 5.00
│ └── scan t
│ ├── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
│ ├── ordering: +1
│ └── limit hint: 5.00
└── 5
build
SELECT k, v FROM t ORDER BY v FETCH FIRST 5 ROWS ONLY
----
limit
├── columns: k:1!null v:2
├── internal-ordering: +2
├── ordering: +2
├── sort
│ ├── columns: k:1!null v:2
│ ├── ordering: +2
│ ├── limit hint: 5.00
│ └── project
│ ├── columns: k:1!null v:2
│ └── scan t
│ └── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
└── 5
build
SELECT k, v FROM t LIMIT (1+2)
----
limit
├── columns: k:1!null v:2
├── project
│ ├── columns: k:1!null v:2
│ └── scan t
│ └── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
└── 1 + 2
build
SELECT k FROM t ORDER BY k FETCH FIRST ROW ONLY
----
limit
├── columns: k:1!null
├── internal-ordering: +1
├── ordering: +1
├── project
│ ├── columns: k:1!null
│ ├── ordering: +1
│ ├── limit hint: 1.00
│ └── scan t
│ ├── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
│ ├── ordering: +1
│ └── limit hint: 1.00
└── 1
build
SELECT k FROM t ORDER BY k OFFSET 3 ROWS FETCH NEXT ROW ONLY
----
limit
├── columns: k:1!null
├── internal-ordering: +1
├── ordering: +1
├── offset
│ ├── columns: k:1!null
│ ├── internal-ordering: +1
│ ├── ordering: +1
│ ├── limit hint: 1.00
│ ├── project
│ │ ├── columns: k:1!null
│ │ ├── ordering: +1
│ │ ├── limit hint: 4.00
│ │ └── scan t
│ │ ├── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
│ │ ├── ordering: +1
│ │ └── limit hint: 4.00
│ └── 3
└── 1
build
SELECT k, v FROM t ORDER BY k OFFSET 5
----
offset
├── columns: k:1!null v:2
├── internal-ordering: +1
├── ordering: +1
├── project
│ ├── columns: k:1!null v:2
│ ├── ordering: +1
│ └── scan t
│ ├── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
│ └── ordering: +1
└── 5
build
SELECT k FROM t ORDER BY k FETCH FIRST (1+1) ROWS ONLY
----
limit
├── columns: k:1!null
├── internal-ordering: +1
├── ordering: +1
├── project
│ ├── columns: k:1!null
│ ├── ordering: +1
│ └── scan t
│ ├── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
│ └── ordering: +1
└── 1 + 1
build
SELECT k FROM T LIMIT k
----
error (42703): column "k" does not exist
build
SELECT k FROM T LIMIT v
----
error (42703): column "v" does not exist
build
SELECT sum(w) FROM t GROUP BY k, v ORDER BY v DESC LIMIT 10
----
limit
├── columns: sum:5 [hidden: v:2]
├── internal-ordering: -2
├── ordering: -2
├── project
│ ├── columns: v:2 sum:5
│ ├── ordering: -2
│ ├── limit hint: 10.00
│ └── group-by
│ ├── columns: k:1!null v:2 sum:5
│ ├── grouping columns: k:1!null v:2
│ ├── ordering: -2
│ ├── limit hint: 10.00
│ ├── sort
│ │ ├── columns: k:1!null v:2 w:3
│ │ ├── ordering: -2
│ │ └── project
│ │ ├── columns: k:1!null v:2 w:3
│ │ └── scan t
│ │ └── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
│ └── aggregations
│ └── sum [as=sum:5]
│ └── w:3
└── 10
build
SELECT DISTINCT v FROM T ORDER BY v LIMIT 10
----
limit
├── columns: v:2
├── internal-ordering: +2
├── ordering: +2
├── sort
│ ├── columns: v:2
│ ├── ordering: +2
│ ├── limit hint: 10.00
│ └── distinct-on
│ ├── columns: v:2
│ ├── grouping columns: v:2
│ └── project
│ ├── columns: v:2
│ └── scan t
│ └── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
└── 10
build
VALUES (1,1), (2,2) ORDER BY 1 LIMIT 1
----
limit
├── columns: column1:1!null column2:2!null
├── internal-ordering: +1
├── ordering: +1
├── sort
│ ├── columns: column1:1!null column2:2!null
│ ├── ordering: +1
│ ├── limit hint: 1.00
│ └── values
│ ├── columns: column1:1!null column2:2!null
│ ├── (1, 1)
│ └── (2, 2)
└── 1
build
(VALUES (1), (1), (1), (2), (2) UNION ALL VALUES (1), (3), (1)) ORDER BY 1 DESC LIMIT 2
----
limit
├── columns: column1:3!null
├── internal-ordering: -3
├── ordering: -3
├── sort
│ ├── columns: column1:3!null
│ ├── ordering: -3
│ ├── limit hint: 2.00
│ └── union-all
│ ├── columns: column1:3!null
│ ├── left columns: column1:1
│ ├── right columns: column1:2
│ ├── values
│ │ ├── columns: column1:1!null
│ │ ├── (1,)
│ │ ├── (1,)
│ │ ├── (1,)
│ │ ├── (2,)
│ │ └── (2,)
│ └── values
│ ├── columns: column1:2!null
│ ├── (1,)
│ ├── (3,)
│ └── (1,)
└── 2
# The ORDER BY and LIMIT apply to the UNION, not the last VALUES.
build
VALUES (1), (1), (1), (2), (2) UNION ALL VALUES (1), (3), (1) ORDER BY 1 DESC LIMIT 2
----
limit
├── columns: column1:3!null
├── internal-ordering: -3
├── ordering: -3
├── sort
│ ├── columns: column1:3!null
│ ├── ordering: -3
│ ├── limit hint: 2.00
│ └── union-all
│ ├── columns: column1:3!null
│ ├── left columns: column1:1
│ ├── right columns: column1:2
│ ├── values
│ │ ├── columns: column1:1!null
│ │ ├── (1,)
│ │ ├── (1,)
│ │ ├── (1,)
│ │ ├── (2,)
│ │ └── (2,)
│ └── values
│ ├── columns: column1:2!null
│ ├── (1,)
│ ├── (3,)
│ └── (1,)
└── 2
build
SELECT k FROM (SELECT k, v FROM t ORDER BY v LIMIT 10)
----
project
├── columns: k:1!null
└── limit
├── columns: k:1!null v:2
├── internal-ordering: +2
├── sort
│ ├── columns: k:1!null v:2
│ ├── ordering: +2
│ ├── limit hint: 10.00
│ └── project
│ ├── columns: k:1!null v:2
│ └── scan t
│ └── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
└── 10
# This kind of query can be used to work around memory usage limits. We need to
# choose the "hard" limit of 100 over the "soft" limit of 25 (with the hard
# limit we will only store 100 rows in the sort node). See #19677.
build
SELECT DISTINCT w FROM (SELECT w FROM t ORDER BY w LIMIT 100) ORDER BY w LIMIT 25
----
limit
├── columns: w:3
├── internal-ordering: +3
├── ordering: +3
├── distinct-on
│ ├── columns: w:3
│ ├── grouping columns: w:3
│ ├── ordering: +3
│ ├── limit hint: 25.00
│ └── limit
│ ├── columns: w:3
│ ├── internal-ordering: +3
│ ├── ordering: +3
│ ├── limit hint: 40.39
│ ├── sort
│ │ ├── columns: w:3
│ │ ├── ordering: +3
│ │ ├── limit hint: 100.00
│ │ └── project
│ │ ├── columns: w:3
│ │ └── scan t
│ │ └── columns: k:1!null v:2 w:3 crdb_internal_mvcc_timestamp:4
│ └── 100
└── 25
build
SELECT * FROM t LIMIT @1
----
error (42703): column reference @1 not allowed in this context
build
SELECT * FROM t OFFSET @1
----
error (42703): column reference @1 not allowed in this context
build
SELECT * FROM t LIMIT count(*)
----
error (42803): count_rows(): aggregate functions are not allowed in LIMIT
build
SELECT * FROM t OFFSET count(*)
----
error (42803): count_rows(): aggregate functions are not allowed in OFFSET
build
SELECT * FROM t LIMIT count(w)
----
error (42703): column "w" does not exist
build
SELECT * FROM t OFFSET count(w)
----
error (42703): column "w" does not exist
build
SELECT sum(v) FROM t GROUP BY k LIMIT count(*) OVER ()
----
error (42P20): count_rows(): window functions are not allowed in LIMIT
build
SELECT sum(v) FROM t GROUP BY k OFFSET count(*) OVER ()
----
error (42P20): count_rows(): window functions are not allowed in OFFSET