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93754: sql: deprecate ordinal column references r=mgartner a=mgartner

#### sql: deprecate ordinal column references

This commit disallows ordinal column references by default. Any
statements using them will result in an error. The session setting
`allow_ordinal_column_references` can be set to true to revert to
previous behavior.

Note that numeric tuple indexing (e.g., `SELECT ((1,2,3)).`@2`)` is still
allowed.

This deprecation is motivated by the inconsistent and surprising
behavior that ordinal column references provide. Ordinal column
references (e.g., `SELECT `@1` FROM t`) are a vestigial and undocumented
feature originally motivated to aid the heuristic planner. The PR that
added them, cockroachdb#10729, discourages their use by users because "they are not
robust against schema changes". It also points out a subtle difference
between ordinal column references and SQL standard ordinals that could
confuse users. As an example, the following statements are not
equivalent:

```sql
SELECT `@2` FROM t ORDER BY `@1;`

SELECT `@2` FROM t ORDER BY 1;
```

In the current implementation, an ordinal column reference ``@n`` resolves
to the n-th column in the current scope's slice of columns. This has
several implications:

1. Ordinal columns can refer to any column, not just columns of data
   sources in `FROM` clauses, as was originally intended. This makes it
   hard to reason about the resolution of an ordinal column reference.
   For example, it's somewhat surprising that the result of the `SELECT`
   below is not `(10, 1)`.

```
CREATE TABLE t (a INT, b INT);
INSERT INTO t VALUES (1, 10);

SELECT `@2,` `@1` FROM (SELECT `@2,` `@1` FROM t);
  ?column? | ?column?
-----------+-----------
         1 |       10
(1 row)
```

2. The ordering of columns in the scope's slice is not guaranteed to be
   consistent, so any reasonable ordinal column resolution occurs
   more-or-less by chance. As an example of unexpected behavior,
   consider:

```
CREATE TABLE t (a INT PRIMARY KEY, INDEX ((a+10)));
INSERT INTO t(a) VALUES (1);
ALTER TABLE t ADD COLUMN b INT;

SELECT `@1,` `@2` FROM t;
  ?column? | ?column?
-----------+-----------
         1 |       11
(1 row)
```

Most users would expect the result of the `SELECT` statement to be
`(1, NULL)` because ``@1`` should resolve to `a` and ``@2`` should resolve
to `b`. Instead, the ordinal column reference ``@2`` circumvents logic
that keeps inaccessible columns from being referenced, and resolves to
the virtual computed column backing the secondary index.

Epic: None

Release note (sql change): Ordinal column references (e.g.,
`SELECT `@1,` `@2` FROM t`) are now deprecated. By default, statements using
this syntax will now result in an error. They can be allowed using the
session setting `SET allow_ordinal_column_references=true`. Support for
ordinal column references is scheduled to be removed in version 23.2.


Co-authored-by: Marcus Gartner <[email protected]>
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craig[bot] and mgartner committed Dec 20, 2022
2 parents 6eddf3e + cfa32f1 commit 060cdcb
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Showing 37 changed files with 179 additions and 101 deletions.
Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@ db1 sc2 tbl2 table false
db1 sc2 f2 function false

query-sql
SELECT @2 FROM [SHOW CREATE FUNCTION sc1.f1]
SELECT create_statement FROM [SHOW CREATE FUNCTION sc1.f1]
----
CREATE FUNCTION sc1.f1(IN a db1.sc1.enum1)
RETURNS INT8
Expand Down Expand Up @@ -85,7 +85,7 @@ USE db1_new
# 2. db name in qualified name is rewritten.
# 3. sequence id is rewritten so that sequence name is deserialized correctly.
query-sql
SELECT @2 FROM [SHOW CREATE FUNCTION sc1.f1]
SELECT create_statement FROM [SHOW CREATE FUNCTION sc1.f1]
----
CREATE FUNCTION sc1.f1(IN a db1_new.sc1.enum1)
RETURNS INT8
Expand Down Expand Up @@ -200,7 +200,7 @@ db1 sc2 tbl2 table true
db1 sc2 f2 function true

query-sql
SELECT @2 FROM [SHOW CREATE FUNCTION sc1.f1]
SELECT create_statement FROM [SHOW CREATE FUNCTION sc1.f1]
----
CREATE FUNCTION sc1.f1(IN a db1.sc1.enum1)
RETURNS INT8
Expand Down Expand Up @@ -236,7 +236,7 @@ USE db1
# 2. db name in qualified name is rewritten.
# 3. sequence id is rewritten so that sequence name is deserialized correctly.
query-sql
SELECT @2 FROM [SHOW CREATE FUNCTION sc1.f1]
SELECT create_statement FROM [SHOW CREATE FUNCTION sc1.f1]
----
CREATE FUNCTION sc1.f1(IN a db1.sc1.enum1)
RETURNS INT8
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -102,7 +102,7 @@ CREATE TABLE t_to_be_hashed (
);

query T
SELECT @2 FROM [SHOW CREATE TABLE t_to_be_hashed];
SELECT create_statement FROM [SHOW CREATE TABLE t_to_be_hashed];
----
CREATE TABLE public.t_to_be_hashed (
a INT8 NOT NULL,
Expand All @@ -120,7 +120,7 @@ statement ok
CREATE INDEX ON t_to_be_hashed (c) USING HASH;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_to_be_hashed];
SELECT create_statement FROM [SHOW CREATE TABLE t_to_be_hashed];
----
CREATE TABLE public.t_to_be_hashed (
a INT8 NOT NULL,
Expand All @@ -140,7 +140,7 @@ statement ok
CREATE UNIQUE INDEX ON t_to_be_hashed (c) USING HASH;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_to_be_hashed];
SELECT create_statement FROM [SHOW CREATE TABLE t_to_be_hashed];
----
CREATE TABLE public.t_to_be_hashed (
a INT8 NOT NULL,
Expand All @@ -161,7 +161,7 @@ statement ok
ALTER TABLE t_to_be_hashed ALTER PRIMARY KEY USING COLUMNS (a) USING HASH;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_to_be_hashed];
SELECT create_statement FROM [SHOW CREATE TABLE t_to_be_hashed];
----
CREATE TABLE public.t_to_be_hashed (
a INT8 NOT NULL,
Expand Down Expand Up @@ -192,7 +192,7 @@ CREATE TABLE t_idx_pk_hashed_1 (
);

query T
SELECT @2 FROM [SHOW CREATE TABLE t_idx_pk_hashed_1];
SELECT create_statement FROM [SHOW CREATE TABLE t_idx_pk_hashed_1];
----
CREATE TABLE public.t_idx_pk_hashed_1 (
crdb_internal_a_shard_16 INT8 NOT VISIBLE NOT NULL AS (mod(fnv32(crdb_internal.datums_to_bytes(a)), 16:::INT8)) VIRTUAL,
Expand Down Expand Up @@ -223,7 +223,7 @@ CREATE TABLE t_idx_pk_hashed_2 (
);

query T
SELECT @2 FROM [SHOW CREATE TABLE t_idx_pk_hashed_2];
SELECT create_statement FROM [SHOW CREATE TABLE t_idx_pk_hashed_2];
----
CREATE TABLE public.t_idx_pk_hashed_2 (
a INT8 NOT NULL,
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,7 @@ CREATE TABLE t_to_be_hashed (
) LOCALITY REGIONAL BY ROW;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_to_be_hashed];
SELECT create_statement FROM [SHOW CREATE TABLE t_to_be_hashed];
----
CREATE TABLE public.t_to_be_hashed (
pk INT8 NOT NULL,
Expand All @@ -58,7 +58,7 @@ statement ok
CREATE INDEX ON t_to_be_hashed (b) USING HASH;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_to_be_hashed];
SELECT create_statement FROM [SHOW CREATE TABLE t_to_be_hashed];
----
CREATE TABLE public.t_to_be_hashed (
pk INT8 NOT NULL,
Expand All @@ -74,7 +74,7 @@ statement ok
CREATE UNIQUE INDEX ON t_to_be_hashed (b) USING HASH;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_to_be_hashed];
SELECT create_statement FROM [SHOW CREATE TABLE t_to_be_hashed];
----
CREATE TABLE public.t_to_be_hashed (
pk INT8 NOT NULL,
Expand All @@ -91,7 +91,7 @@ statement ok
ALTER TABLE t_to_be_hashed ALTER PRIMARY KEY USING COLUMNS (pk) USING HASH;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_to_be_hashed];
SELECT create_statement FROM [SHOW CREATE TABLE t_to_be_hashed];
----
CREATE TABLE public.t_to_be_hashed (
pk INT8 NOT NULL,
Expand All @@ -114,7 +114,7 @@ CREATE TABLE t_regional_pk_hashed_1 (
) LOCALITY REGIONAL BY ROW;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_regional_pk_hashed_1];
SELECT create_statement FROM [SHOW CREATE TABLE t_regional_pk_hashed_1];
----
CREATE TABLE public.t_regional_pk_hashed_1 (
crdb_internal_pk_shard_16 INT8 NOT VISIBLE NOT NULL AS (mod(fnv32(crdb_internal.datums_to_bytes(pk)), 16:::INT8)) VIRTUAL,
Expand All @@ -137,7 +137,7 @@ CREATE TABLE t_regional_pk_hashed_2 (
) LOCALITY REGIONAL BY ROW;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_regional_pk_hashed_2];
SELECT create_statement FROM [SHOW CREATE TABLE t_regional_pk_hashed_2];
----
CREATE TABLE public.t_regional_pk_hashed_2 (
pk INT8 NOT NULL,
Expand Down
4 changes: 2 additions & 2 deletions pkg/cli/clisqlshell/sql_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,7 @@ func Example_sql() {
// growing capacity starting at 1 (the batch sizes will be 1, 2, 4, ...),
// and with the query below the division by zero error will occur after the
// first batch consisting of 1 row has been returned to the client.
c.RunWithArgs([]string{`sql`, `-e`, `select 1/(@1-2) from generate_series(1,3)`})
c.RunWithArgs([]string{`sql`, `-e`, `select 1/(i-2) from generate_series(1,3) g(i)`})
c.RunWithArgs([]string{`sql`, `-e`, `SELECT '20:01:02+03:04:05'::timetz AS regression_65066`})
c.RunWithArgs([]string{`sql`, `-e`, `CREATE USER my_user WITH CREATEDB; GRANT admin TO my_user;`})
c.RunWithArgs([]string{`sql`, `-e`, `\du my_user`})
Expand Down Expand Up @@ -116,7 +116,7 @@ func Example_sql() {
// CREATE TABLE
// x
// sql -e copy t.f from stdin
// sql -e select 1/(@1-2) from generate_series(1,3)
// sql -e select 1/(i-2) from generate_series(1,3) g(i)
// ?column?
// -1.0000000000000000000
// (error encountered after some results were delivered)
Expand Down
2 changes: 1 addition & 1 deletion pkg/cli/interactive_tests/test_notice.tcl
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ spawn $argv demo --no-line-editor --no-example-database
eexpect root@

start_test "Test that notices always appear at the end after all results."
send "SELECT IF(@1=4,crdb_internal.notice('hello'),@1) AS MYRES FROM generate_series(1,10);\r"
send "SELECT IF(i=4,crdb_internal.notice('hello'),i) AS MYRES FROM generate_series(1,10) g(i);\r"
eexpect myres
eexpect 1
eexpect 10
Expand Down
12 changes: 6 additions & 6 deletions pkg/cli/interactive_tests/test_url_db_override.tcl
Original file line number Diff line number Diff line change
Expand Up @@ -50,25 +50,25 @@ end_test


start_test "Check that the database flag overrides the db if URL is already set."
spawn $argv sql --url "postgresql://root@localhost:26257/system?sslmode=disable" -e "select length(@1) as l, @1 as db from \[show database\]" --format=csv
spawn $argv sql --url "postgresql://root@localhost:26257/system?sslmode=disable" -e "select length(database) as l, database as db from \[show database\]" --format=csv
eexpect "l,db"
eexpect "6,system"
eexpect eof

spawn $argv sql --url "postgresql://root@localhost:26257/system?sslmode=disable" --database test -e "select length(@1) as l, @1 as db from \[show database\]" --format=csv
spawn $argv sql --url "postgresql://root@localhost:26257/system?sslmode=disable" --database test -e "select length(database) as l, database as db from \[show database\]" --format=csv
eexpect "l,db"
eexpect "4,test"
eexpect eof
end_test

start_test "Check that the database flag does override the database if none was present in the URL."
# Use empty path.
spawn $argv sql --url "postgresql://root@localhost:26257?sslmode=disable" --database system -e "select length(@1) as l, @1 as db from \[show database\]" --format=csv
spawn $argv sql --url "postgresql://root@localhost:26257?sslmode=disable" --database system -e "select length(database) as l, database as db from \[show database\]" --format=csv
eexpect "l,db"
eexpect "6,system"
eexpect eof
# Use path = /
spawn $argv sql --url "postgresql://root@localhost:26257/?sslmode=disable" --database system -e "select length(@1) as l, @1 as db from \[show database\]" --format=csv
spawn $argv sql --url "postgresql://root@localhost:26257/?sslmode=disable" --database system -e "select length(database) as l, database as db from \[show database\]" --format=csv
eexpect "l,db"
eexpect "6,system"
eexpect eof
Expand All @@ -84,12 +84,12 @@ end_test
set ::env(COCKROACH_INSECURE) "false"

start_test "Check that the user flag override the user if URL is already set."
spawn $argv sql --url "postgresql://test@localhost:26257?sslmode=disable" -e "select length(@1) as l, @1 as u from \[show session_user\]" --format=csv
spawn $argv sql --url "postgresql://test@localhost:26257?sslmode=disable" -e "select length(session_user) as l, session_user as u from \[show session_user\]" --format=csv
eexpect "l,u"
eexpect "4,test"
eexpect eof

spawn $argv sql --url "postgresql://root@localhost:26257?sslmode=disable" --user test -e "select length(@1) as l, @1 as u from \[show session_user\]" --format=csv
spawn $argv sql --url "postgresql://root@localhost:26257?sslmode=disable" --user test -e "select length(session_user) as l, session_user as u from \[show session_user\]" --format=csv
eexpect "l,u"
eexpect "4,test"
eexpect eof
Expand Down
8 changes: 4 additions & 4 deletions pkg/sql/delegate/show_syntax.go
Original file line number Diff line number Diff line change
Expand Up @@ -27,17 +27,17 @@ import (
func (d *delegator) delegateShowSyntax(n *tree.ShowSyntax) (tree.Statement, error) {
// Construct an equivalent SELECT query that produces the results:
//
// SELECT @1 AS field, @2 AS message
// SELECT f AS field, m AS message
// FROM (VALUES
// ('file', 'foo.go'),
// ('line', '123'),
// ('function', 'blix()'),
// ('detail', 'some details'),
// ('hint', 'some hints'))
// ('hint', 'some hints')) v(f, m)
//
var query bytes.Buffer
fmt.Fprintf(
&query, "SELECT @1 AS %s, @2 AS %s FROM (VALUES ",
&query, "SELECT f AS %s, m AS %s FROM (VALUES ",
colinfo.ShowSyntaxColumns[0].Name, colinfo.ShowSyntaxColumns[1].Name,
)

Expand All @@ -64,7 +64,7 @@ func (d *delegator) delegateShowSyntax(n *tree.ShowSyntax) (tree.Statement, erro
},
nil, /* reportErr */
)
query.WriteByte(')')
query.WriteString(") v(f, m)")

return parse(query.String())
}
4 changes: 4 additions & 0 deletions pkg/sql/exec_util.go
Original file line number Diff line number Diff line change
Expand Up @@ -3381,6 +3381,10 @@ func (m *sessionDataMutator) SetExperimentalHashGroupJoinEnabled(val bool) {
m.data.ExperimentalHashGroupJoinEnabled = val
}

func (m *sessionDataMutator) SetAllowOrdinalColumnReference(val bool) {
m.data.AllowOrdinalColumnReferences = val
}

// Utility functions related to scrubbing sensitive information on SQL Stats.

// quantizeCounts ensures that the Count field in the
Expand Down
12 changes: 6 additions & 6 deletions pkg/sql/logictest/testdata/logic_test/alter_primary_key
Original file line number Diff line number Diff line change
Expand Up @@ -1394,7 +1394,7 @@ statement ok
ALTER TABLE t ALTER PRIMARY KEY USING COLUMNS (k);

query T
SELECT @2 FROM [SHOW CREATE TABLE t];
SELECT create_statement FROM [SHOW CREATE TABLE t];
----
CREATE TABLE public.t (
a INT8 NOT NULL,
Expand Down Expand Up @@ -1430,7 +1430,7 @@ statement ok
ALTER TABLE t ALTER PRIMARY KEY USING COLUMNS (b, k);

query T
SELECT @2 FROM [SHOW CREATE TABLE t];
SELECT create_statement FROM [SHOW CREATE TABLE t];
----
CREATE TABLE public.t (
a INT8 NOT NULL,
Expand Down Expand Up @@ -1474,7 +1474,7 @@ statement ok
ALTER TABLE t ALTER PRIMARY KEY USING COLUMNS (a);

query T
SELECT @2 FROM [SHOW CREATE TABLE t];
SELECT create_statement FROM [SHOW CREATE TABLE t];
----
CREATE TABLE public.t (
a INT8 NOT NULL,
Expand Down Expand Up @@ -1548,7 +1548,7 @@ statement ok
ALTER TABLE t_test_param ALTER PRIMARY KEY USING COLUMNS (b) USING HASH WITH BUCKET_COUNT = 5;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_test_param]
SELECT create_statement FROM [SHOW CREATE TABLE t_test_param]
----
CREATE TABLE public.t_test_param (
a INT8 NOT NULL,
Expand Down Expand Up @@ -1578,7 +1578,7 @@ COMMENT ON CONSTRAINT i2 ON pkey_comment IS 'idx3';

# Comment should exist inside the create statement, so filter it out
query T
SELECT substring(@2, strpos(@2, 'COMMENT')) FROM [SHOW CREATE pkey_comment];
SELECT substring(create_statement, strpos(create_statement, 'COMMENT')) FROM [SHOW CREATE pkey_comment];
----
COMMENT ON INDEX public.pkey_comment@pkey IS 'idx';
COMMENT ON INDEX public.pkey_comment@i2 IS 'idx2';
Expand All @@ -1592,7 +1592,7 @@ ALTER TABLE pkey_comment ALTER PRIMARY KEY USING COLUMNS (b);
# No comment exists inside the CREATE statement
skipif config local-legacy-schema-changer
query T
SELECT substring(@2, strpos(@2, 'COMMENT')) FROM [SHOW CREATE pkey_comment];
SELECT substring(create_statement, strpos(create_statement, 'COMMENT')) FROM [SHOW CREATE pkey_comment];
----
COMMENT ON INDEX public.pkey_comment@pkey IS 'idx';
COMMENT ON INDEX public.pkey_comment@i2 IS 'idx2';
Expand Down
2 changes: 1 addition & 1 deletion pkg/sql/logictest/testdata/logic_test/array
Original file line number Diff line number Diff line change
Expand Up @@ -333,7 +333,7 @@ a

# From a column ordinal.
query T
SELECT @1[1] FROM (SELECT ARRAY['a','b','c'] AS a)
SELECT a[1] FROM (SELECT ARRAY['a','b','c'] AS a)
----
a

Expand Down
2 changes: 1 addition & 1 deletion pkg/sql/logictest/testdata/logic_test/create_index
Original file line number Diff line number Diff line change
Expand Up @@ -387,7 +387,7 @@ statement ok
CREATE UNIQUE INDEX idx_t_hash_b ON t_hash (b) USING HASH WITH BUCKET_COUNT = 5;

query T
SELECT @2 FROM [SHOW CREATE TABLE t_hash]
SELECT create_statement FROM [SHOW CREATE TABLE t_hash]
----
CREATE TABLE public.t_hash (
pk INT8 NOT NULL,
Expand Down
4 changes: 2 additions & 2 deletions pkg/sql/logictest/testdata/logic_test/create_table
Original file line number Diff line number Diff line change
Expand Up @@ -847,7 +847,7 @@ CREATE TABLE t_good_hash_indexes_1 (
);

query T
SELECT @2 FROM [SHOW CREATE TABLE t_good_hash_indexes_1];
SELECT create_statement FROM [SHOW CREATE TABLE t_good_hash_indexes_1];
----
CREATE TABLE public.t_good_hash_indexes_1 (
crdb_internal_a_shard_5 INT8 NOT VISIBLE NOT NULL AS (mod(fnv32(crdb_internal.datums_to_bytes(a)), 5:::INT8)) VIRTUAL,
Expand All @@ -866,7 +866,7 @@ CREATE TABLE t_good_hash_indexes_2 (
);

query T
SELECT @2 FROM [SHOW CREATE TABLE t_good_hash_indexes_2];
SELECT create_statement FROM [SHOW CREATE TABLE t_good_hash_indexes_2];
----
CREATE TABLE public.t_good_hash_indexes_2 (
a INT8 NOT NULL,
Expand Down
10 changes: 5 additions & 5 deletions pkg/sql/logictest/testdata/logic_test/hash_sharded_index
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
# Tests for creating a hash sharded primary key
statement ok
statement ok
CREATE TABLE sharded_primary (a INT PRIMARY KEY USING HASH WITH (bucket_count=10))

query TT
Expand Down Expand Up @@ -769,7 +769,7 @@ statement ok
$create_statement

query T
SELECT @2 FROM [SHOW CREATE TABLE t]
SELECT create_statement FROM [SHOW CREATE TABLE t]
----
CREATE TABLE public.t (
crdb_internal_a_shard_8 INT8 NOT VISIBLE NOT NULL AS (mod(fnv32(crdb_internal.datums_to_bytes(a)), 8:::INT8)) VIRTUAL,
Expand All @@ -792,7 +792,7 @@ CREATE TABLE public.t (
)

query T
SELECT @2 FROM [SHOW CREATE TABLE t]
SELECT create_statement FROM [SHOW CREATE TABLE t]
----
CREATE TABLE public.t (
crdb_internal_a_shard_8 INT4 NOT VISIBLE NOT NULL AS (mod(fnv32(crdb_internal.datums_to_bytes(a)), 8:::INT8)) VIRTUAL,
Expand Down Expand Up @@ -856,7 +856,7 @@ CREATE TABLE t_default_bucket_16 (
);

query T
SELECT @2 FROM [SHOW CREATE TABLE t_default_bucket_16]
SELECT create_statement FROM [SHOW CREATE TABLE t_default_bucket_16]
----
CREATE TABLE public.t_default_bucket_16 (
crdb_internal_a_shard_16 INT8 NOT VISIBLE NOT NULL AS (mod(fnv32(crdb_internal.datums_to_bytes(a)), 16:::INT8)) VIRTUAL,
Expand All @@ -879,7 +879,7 @@ statement ok
CREATE TABLE t_default_bucket_8 (a INT PRIMARY KEY USING HASH);

query T
SELECT @2 FROM [SHOW CREATE TABLE t_default_bucket_8]
SELECT create_statement FROM [SHOW CREATE TABLE t_default_bucket_8]
----
CREATE TABLE public.t_default_bucket_8 (
crdb_internal_a_shard_8 INT8 NOT VISIBLE NOT NULL AS (mod(fnv32(crdb_internal.datums_to_bytes(a)), 8:::INT8)) VIRTUAL,
Expand Down
1 change: 1 addition & 0 deletions pkg/sql/logictest/testdata/logic_test/information_schema
Original file line number Diff line number Diff line change
Expand Up @@ -4741,6 +4741,7 @@ WHERE
);
----
variable value
allow_ordinal_column_references off
allow_prepare_as_opt_plan off
alter_primary_region_super_region_override off
application_name ·
Expand Down
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