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Merged
jrgemignani merged 4 commits into from
Jun 17, 2025
Merged

Reimplement list comprehension #2189

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5f646f1
Fix issue 1955 - List comprehension in WHERE clause (#2094)
MuhammadTahaNaveed Sep 9, 2024
e4440ad
Fix CI build errors caused by missing dependencies (#2163)
MuhammadTahaNaveed May 8, 2025
cea8c0a
Fix issue with the CI build and labeler (#2183)
jrgemignani Jun 2, 2025
d1bd110
Reimplement list comprehension (#2169)
MuhammadTahaNaveed Jun 10, 2025
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9 changes: 7 additions & 2 deletions .github/workflows/installcheck.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ jobs:
steps:
- name: Get latest commit id of PostgreSQL 16
run: |
echo "PG_COMMIT_HASH=$(git ls-remote git://git.postgresql.org/git/postgresql.git refs/heads/REL_16_STABLE | awk '{print $1}')" >> $GITHUB_ENV
echo "PG_COMMIT_HASH=$(git ls-remote https://git.postgresql.org/git/postgresql.git refs/heads/REL_16_STABLE | awk '{print $1}')" >> $GITHUB_ENV

- name: Cache PostgreSQL 16
uses: actions/cache@v3
Expand All @@ -22,10 +22,15 @@ jobs:
path: ~/pg16
key: ${{ runner.os }}-v1-pg16-${{ env.PG_COMMIT_HASH }}

- name: Install necessary dependencies
run: |
sudo apt-get update
sudo apt-get install -y build-essential libreadline-dev zlib1g-dev flex bison

- name: Install PostgreSQL 16 and some extensions
if: steps.pg16cache.outputs.cache-hit != 'true'
run: |
git clone --depth 1 --branch REL_16_STABLE git://git.postgresql.org/git/postgresql.git ~/pg16source
git clone --depth 1 --branch REL_16_STABLE https://git.postgresql.org/git/postgresql.git ~/pg16source
cd ~/pg16source
./configure --prefix=$HOME/pg16 CFLAGS="-std=gnu99 -ggdb -O0" --enable-cassert
make install -j$(nproc) > /dev/null
Expand Down
3 changes: 3 additions & 0 deletions .github/workflows/labeler.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,9 @@ jobs:
pull-requests: write
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout@v3

- name: Apply branch labels
uses: actions/labeler@v5.0.0

Expand Down
13 changes: 12 additions & 1 deletion age--1.5.0--y.y.y.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -137,4 +137,15 @@ PARALLEL SAFE
AS 'MODULE_PATHNAME';

CREATE CAST (agtype AS json)
WITH FUNCTION ag_catalog.agtype_to_json(agtype);
WITH FUNCTION ag_catalog.agtype_to_json(agtype);

CREATE FUNCTION ag_catalog.agtype_array_to_agtype(agtype[])
RETURNS agtype
LANGUAGE c
IMMUTABLE
RETURNS NULL ON NULL INPUT
PARALLEL SAFE
AS 'MODULE_PATHNAME';

CREATE CAST (agtype[] AS agtype)
WITH FUNCTION ag_catalog.agtype_array_to_agtype(agtype[]);
135 changes: 119 additions & 16 deletions regress/expected/list_comprehension.out
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Expand Up @@ -166,45 +166,50 @@ SELECT * FROM cypher('list_comprehension', $$ MATCH p=(u) RETURN [i IN range(0,
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) RETURN [i IN u.list] $$) AS (result agtype);
result
-------------------------
[0, 2, 4, 6, 8, 10, 12]
[1, 3, 5, 7, 9, 11, 13]
[]
[0, 2, 4, 6, 8, 10, 12]
(3 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u) RETURN [i IN u.list WHERE i % 3 = 0] $$) AS (result agtype);
result
------------
[0, 6, 12]
[3, 9]
(2 rows)
[]
(3 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u) RETURN [i IN u.list WHERE i % 3 = 0 | i/3] $$) AS (result agtype);
result
-----------
[0, 2, 4]
[1, 3]
(2 rows)
[]
(3 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u) RETURN [i IN u.list WHERE i % 3 = 0 | i/3][1] $$) AS (result agtype);
result
--------
2
3
(2 rows)

(3 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u) RETURN [i IN u.list WHERE i % 3 = 0 | i/3][0..2] $$) AS (result agtype);
result
--------
[0, 2]
[1, 3]
(2 rows)
[]
(3 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u) RETURN [i IN u.list WHERE i % 3 = 0 | i/3][0..2][1] $$) AS (result agtype);
result
--------
2
3
(2 rows)

(3 rows)

-- Nested cases
SELECT * FROM cypher('list_comprehension', $$ RETURN [i IN [i IN [1,2,3]]] $$) AS (result agtype);
Expand Down Expand Up @@ -299,9 +304,9 @@ SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WHERE u.list@>[i IN rang
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) MATCH (v) WHERE v.list=[i IN u.list] RETURN v $$) AS (result agtype);
result
-----------------------------------------------------------------------------------------------
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
{"id": 281474976710657, "label": "", "properties": {"list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710658, "label": "", "properties": {"list": [1, 3, 5, 7, 9, 11, 13]}}::vertex
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
(3 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list:[i IN range(0,12,2)]}) RETURN u $$) AS (result agtype);
Expand Down Expand Up @@ -330,11 +335,11 @@ SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list:[i IN range(1,13,2)
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) MATCH (v {list:[i IN u.list]}) RETURN v $$) AS (result agtype);
result
-----------------------------------------------------------------------------------------------
{"id": 281474976710658, "label": "", "properties": {"list": [1, 3, 5, 7, 9, 11, 13]}}::vertex
{"id": 281474976710657, "label": "", "properties": {"list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
{"id": 281474976710658, "label": "", "properties": {"list": [1, 3, 5, 7, 9, 11, 13]}}::vertex
{"id": 281474976710657, "label": "", "properties": {"list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710658, "label": "", "properties": {"list": [1, 3, 5, 7, 9, 11, 13]}}::vertex
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
(5 rows)

SELECT * FROM cypher('list_comprehension', $$ CREATE (u {list:[i IN range(12,24,2)]}) RETURN u $$) AS (result agtype);
Expand Down Expand Up @@ -371,26 +376,26 @@ SELECT * FROM cypher('list_comprehension', $$ MATCH(u) WITH u WHERE u.list = [u
SELECT * FROM cypher('list_comprehension', $$ MATCH(u) WITH u WHERE u.list = [u IN [0, 2, 4, 6, 8, 10, 12]] OR size(u.list) = 0 RETURN u $$) AS (u agtype);
u
-----------------------------------------------------------------------------------------------
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
{"id": 281474976710657, "label": "", "properties": {"list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
(2 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH(u) WITH u WHERE u.list = [u IN [0, 2, 4, 6, 8, 10, 12]] OR size(u.list)::bool RETURN u $$) AS (u agtype);
u
--------------------------------------------------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {"list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710658, "label": "", "properties": {"list": [1, 3, 5, 7, 9, 11, 13]}}::vertex
{"id": 281474976710661, "label": "", "properties": {"list": [6, 8, 10, 12]}}::vertex
{"id": 281474976710660, "label": "", "properties": {"list": [12, 14, 16, 18, 20, 22, 24]}}::vertex
{"id": 281474976710661, "label": "", "properties": {"list": [6, 8, 10, 12]}}::vertex
{"id": 281474976710662, "label": "", "properties": {"list": [25.0, 49.0, 81.0, 121.0, 169.0]}}::vertex
{"id": 281474976710657, "label": "", "properties": {"list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710663, "label": "", "properties": {"list": [1, 2, 3]}}::vertex
(6 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH(u) WITH u WHERE u.list = [u IN [0, 2, 4, 6, 8, 10, 12]] OR NOT size(u.list)::bool RETURN u $$) AS (u agtype);
u
-----------------------------------------------------------------------------------------------
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
{"id": 281474976710657, "label": "", "properties": {"list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
(2 rows)

SELECT * FROM cypher('list_comprehension', $$ CREATE(u:csm_match {list: ['abc', 'def', 'ghi']}) $$) AS (u agtype);
Expand Down Expand Up @@ -473,9 +478,6 @@ SELECT * FROM cypher('list_comprehension', $$ MATCH(u {list: [0, 2, 4, 6, 8, 10,
ERROR: Invalid use of aggregation in this context
LINE 1: ..., $$ MATCH(u {list: [0, 2, 4, 6, 8, 10, 12]}) SET u.c = coll...
^
-- Known issue
SELECT * FROM cypher('list_comprehension', $$ MERGE (u {list:[i IN [1,2,3]]}) RETURN u $$) AS (result agtype);
ERROR: Aggref found in non-Agg plan node
-- List comprehension variable scoping
SELECT * FROM cypher('list_comprehension', $$ WITH 1 AS m, [m IN [1, 2, 3]] AS n RETURN [m IN [1, 2, 3]] $$) AS (result agtype);
result
Expand Down Expand Up @@ -617,6 +619,107 @@ SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WITH *, [i in [1,2,3]] a
[1, 2, 3]
(1 row)

-- Issue 1955 - variable reference in list comprehension
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WHERE u.list=[i IN u.list] RETURN u $$) AS (result agtype);
result
---------------------------------------------------------------------------------------------------------------------------------------------------------------
{"id": 281474976710658, "label": "", "properties": {"list": [1, 3, 5, 7, 9, 11, 13]}}::vertex
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
{"id": 281474976710660, "label": "", "properties": {"list": [12, 14, 16, 18, 20, 22, 24]}}::vertex
{"id": 281474976710661, "label": "", "properties": {"list": [6, 8, 10, 12]}}::vertex
{"id": 281474976710662, "label": "", "properties": {"list": [25.0, 49.0, 81.0, 121.0, 169.0]}}::vertex
{"id": 281474976710663, "label": "", "properties": {"list": [1, 2, 3]}}::vertex
{"id": 281474976710657, "label": "", "properties": {"a": [], "b": [0, 1, 2, 3, 4, 5], "c": [0, 2, 4, 6, 8, 10, 12], "list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 844424930131969, "label": "csm_match", "properties": {"list": ["abc", "def", "ghi"]}}::vertex
(8 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WHERE u.list=[i IN u.list WHERE i>0] RETURN u $$) AS (result agtype);
result
--------------------------------------------------------------------------------------------------------
{"id": 281474976710658, "label": "", "properties": {"list": [1, 3, 5, 7, 9, 11, 13]}}::vertex
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
{"id": 281474976710660, "label": "", "properties": {"list": [12, 14, 16, 18, 20, 22, 24]}}::vertex
{"id": 281474976710661, "label": "", "properties": {"list": [6, 8, 10, 12]}}::vertex
{"id": 281474976710662, "label": "", "properties": {"list": [25.0, 49.0, 81.0, 121.0, 169.0]}}::vertex
{"id": 281474976710663, "label": "", "properties": {"list": [1, 2, 3]}}::vertex
(6 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WHERE size([e in u.list where e starts with "a"])>0 RETURN u $$) AS (result agtype);
result
------------------------------------------------------------------------------------------------------
{"id": 844424930131969, "label": "csm_match", "properties": {"list": ["abc", "def", "ghi"]}}::vertex
(1 row)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u ={list:[i IN u.list | i+1]}) RETURN u $$) AS (result agtype);
result
--------------------------------------------------------------------------
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
(1 row)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u ={list:[i IN u.list WHERE i>0]}) RETURN u$$) AS (result agtype);
result
--------------------------------------------------------------------------------------------------------
{"id": 281474976710658, "label": "", "properties": {"list": [1, 3, 5, 7, 9, 11, 13]}}::vertex
{"id": 281474976710659, "label": "", "properties": {"list": []}}::vertex
{"id": 281474976710660, "label": "", "properties": {"list": [12, 14, 16, 18, 20, 22, 24]}}::vertex
{"id": 281474976710661, "label": "", "properties": {"list": [6, 8, 10, 12]}}::vertex
{"id": 281474976710662, "label": "", "properties": {"list": [25.0, 49.0, 81.0, 121.0, 169.0]}}::vertex
{"id": 281474976710663, "label": "", "properties": {"list": [1, 2, 3]}}::vertex
(6 rows)

-- List comprehension in MERGE
SELECT * FROM cypher('list_comprehension', $$ MERGE (u {list:[i IN [1,2,3]]}) RETURN u $$) AS (result agtype);
result
---------------------------------------------------------------------------------
{"id": 281474976710663, "label": "", "properties": {"list": [1, 2, 3]}}::vertex
(1 row)

SELECT * FROM cypher('list_comprehension', $$ MERGE (u ={list:[i IN [1,2,3] WHERE i>1]}) RETURN u $$) AS (result agtype);
result
------------------------------------------------------------------------------
{"id": 281474976710666, "label": "", "properties": {"list": [2, 3]}}::vertex
(1 row)

SELECT * FROM cypher('list_comprehension', $$ MERGE (u ={list:[i IN [1,2,3] WHERE i>1 | i^2]}) RETURN u $$) AS (result agtype);
result
----------------------------------------------------------------------------------
{"id": 281474976710667, "label": "", "properties": {"list": [4.0, 9.0]}}::vertex
(1 row)

-- Issue 1850
SELECT * FROM cypher('list_comprehension', $$ CREATE (u {list: [0, 2, 4, 6, 8, 10, 12]}) $$) AS (result agtype);
result
--------
(0 rows)

SELECT * FROM cypher('list_comprehension', $$ WITH [1, 2, 3] AS u UNWIND collect(u) AS v RETURN v $$) AS (result agtype);
ERROR: Invalid use of aggregation in this context
LINE 1: ...ist_comprehension', $$ WITH [1, 2, 3] AS u UNWIND collect(u)...
^
SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) WITH u, collect(u.list) AS v SET u += {b: [u IN range(0, 5)]} SET u.c = [u IN v[0]] RETURN u $$) AS (result agtype);
result
---------------------------------------------------------------------------------------------------------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {"a": [], "b": [0, 1, 2, 3, 4, 5], "c": [0, 2, 4, 6, 8, 10, 12], "list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710668, "label": "", "properties": {"b": [0, 1, 2, 3, 4, 5], "c": [0, 2, 4, 6, 8, 10, 12], "list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
(2 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) SET u.c = collect(u.list) RETURN u $$) AS (u agtype);
ERROR: Invalid use of aggregation in this context
LINE 1: ... $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) SET u.c = coll...
^
SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) WHERE u.list = [u IN [1, u]] RETURN u $$) AS (u agtype);
u
---
(0 rows)

SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) WHERE u.list IN [u IN [1, u.list]] RETURN u $$) AS (u agtype);
u
---------------------------------------------------------------------------------------------------------------------------------------------------------------
{"id": 281474976710657, "label": "", "properties": {"a": [], "b": [0, 1, 2, 3, 4, 5], "c": [0, 2, 4, 6, 8, 10, 12], "list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
{"id": 281474976710668, "label": "", "properties": {"b": [0, 1, 2, 3, 4, 5], "c": [0, 2, 4, 6, 8, 10, 12], "list": [0, 2, 4, 6, 8, 10, 12]}}::vertex
(2 rows)

-- Clean up
SELECT * FROM drop_graph('list_comprehension', true);
NOTICE: drop cascades to 4 other objects
DETAIL: drop cascades to table list_comprehension._ag_label_vertex
Expand Down
24 changes: 21 additions & 3 deletions regress/sql/list_comprehension.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -117,9 +117,6 @@ SELECT * FROM cypher('list_comprehension', $$ MATCH(u {list: [0, 2, 4, 6, 8, 10,
-- invalid use of aggregation in SET
SELECT * FROM cypher('list_comprehension', $$ MATCH(u {list: [0, 2, 4, 6, 8, 10, 12]}) SET u.c = collect(u.list) RETURN u $$) AS (u agtype);

-- Known issue
SELECT * FROM cypher('list_comprehension', $$ MERGE (u {list:[i IN [1,2,3]]}) RETURN u $$) AS (result agtype);

-- List comprehension variable scoping
SELECT * FROM cypher('list_comprehension', $$ WITH 1 AS m, [m IN [1, 2, 3]] AS n RETURN [m IN [1, 2, 3]] $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ WITH 1 AS m RETURN [m IN [1, 2, 3]], m $$) AS (result agtype, result2 agtype);
Expand Down Expand Up @@ -157,4 +154,25 @@ SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WITH * WHERE u.list=[i I
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WITH * WITH *, [i in [1,2,3]] as list RETURN list LIMIT 1 $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WITH *, [i in [1,2,3]] as list WITH * RETURN list LIMIT 1 $$) AS (result agtype);

-- Issue 1955 - variable reference in list comprehension
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WHERE u.list=[i IN u.list] RETURN u $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WHERE u.list=[i IN u.list WHERE i>0] RETURN u $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u) WHERE size([e in u.list where e starts with "a"])>0 RETURN u $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u ={list:[i IN u.list | i+1]}) RETURN u $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u ={list:[i IN u.list WHERE i>0]}) RETURN u$$) AS (result agtype);

-- List comprehension in MERGE
SELECT * FROM cypher('list_comprehension', $$ MERGE (u {list:[i IN [1,2,3]]}) RETURN u $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MERGE (u ={list:[i IN [1,2,3] WHERE i>1]}) RETURN u $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MERGE (u ={list:[i IN [1,2,3] WHERE i>1 | i^2]}) RETURN u $$) AS (result agtype);

-- Issue 1850
SELECT * FROM cypher('list_comprehension', $$ CREATE (u {list: [0, 2, 4, 6, 8, 10, 12]}) $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ WITH [1, 2, 3] AS u UNWIND collect(u) AS v RETURN v $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) WITH u, collect(u.list) AS v SET u += {b: [u IN range(0, 5)]} SET u.c = [u IN v[0]] RETURN u $$) AS (result agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) SET u.c = collect(u.list) RETURN u $$) AS (u agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) WHERE u.list = [u IN [1, u]] RETURN u $$) AS (u agtype);
SELECT * FROM cypher('list_comprehension', $$ MATCH (u {list: [0, 2, 4, 6, 8, 10, 12]}) WHERE u.list IN [u IN [1, u.list]] RETURN u $$) AS (u agtype);

-- Clean up
SELECT * FROM drop_graph('list_comprehension', true);
11 changes: 11 additions & 0 deletions sql/agtype_coercions.sql
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -173,3 +173,14 @@ AS 'MODULE_PATHNAME';

CREATE CAST (agtype AS json)
WITH FUNCTION ag_catalog.agtype_to_json(agtype);

CREATE FUNCTION ag_catalog.agtype_array_to_agtype(agtype[])
RETURNS agtype
LANGUAGE c
IMMUTABLE
RETURNS NULL ON NULL INPUT
PARALLEL SAFE
AS 'MODULE_PATHNAME';

CREATE CAST (agtype[] AS agtype)
WITH FUNCTION ag_catalog.agtype_array_to_agtype(agtype[]);
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