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Fix crash caused by some form of ALTER TABLE ADD COLUMN statements. #7522

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merged 3 commits into from
Mar 20, 2024
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Fix crash caused by some form of ALTER TABLE ADD COLUMN statements. #7522

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94a8fd7
Fix the crash
emelsimsek Feb 19, 2024
eb275e1
Add test
emelsimsek Feb 20, 2024
4d0fb50
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emelsimsek Feb 20, 2024
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10 changes: 7 additions & 3 deletions src/backend/distributed/commands/table.c
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adding a test would be nice, at least the one noted in linked issue

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I was just going to note that I did not think this deserved a test :)

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We generally try to add all crashes that we fix as a test, for two reasons:

  1. Make sure that we don't regress in the future
  2. Generally these crashes happen because of using uncommon SQL features. And increasing our coverage for such uncommon features is quite useful for catching other issues too (e.g. we've caught issues introduced in new PG beta versions because our test suite tests some stuff better than Postgres).

Sometimes we don't of course, for instance if it's hard to reproduce the test reliably. But in this case I think adding the test should be very simple.

Original file line number Diff line number Diff line change
Expand Up @@ -3053,11 +3053,15 @@
else if (constraint->contype == CONSTR_FOREIGN)
{
RangeVar *referencedTable = constraint->pktable;
char *referencedColumn = strVal(lfirst(list_head(constraint->pk_attrs)));
Oid referencedRelationId = RangeVarGetRelid(referencedTable, NoLock, false);

appendStringInfo(errHint, "FOREIGN KEY (%s) REFERENCES %s(%s)", colName,
get_rel_name(referencedRelationId), referencedColumn);
appendStringInfo(errHint, "FOREIGN KEY (%s) REFERENCES %s", colName,

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get_rel_name(referencedRelationId));

if (list_length(constraint->pk_attrs) > 0)
{
AppendColumnNameList(errHint, constraint->pk_attrs);

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}

if (constraint->fk_del_action == FKCONSTR_ACTION_SETNULL)
{
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2 changes: 1 addition & 1 deletion src/backend/distributed/deparser/deparse_table_stmts.c
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Original file line number Diff line number Diff line change
Expand Up @@ -121,7 +121,7 @@ AppendAlterTableStmt(StringInfo buf, AlterTableStmt *stmt)
* AppendColumnNameList converts a list of columns into comma separated string format
* (colname_1, colname_2, .., colname_n).
*/
static void
void
AppendColumnNameList(StringInfo buf, List *columns)
{
appendStringInfoString(buf, " (");
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2 changes: 2 additions & 0 deletions src/include/distributed/deparser.h
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Original file line number Diff line number Diff line change
Expand Up @@ -121,6 +121,8 @@ extern void AppendGrantedByInGrant(StringInfo buf, GrantStmt *stmt);
extern void AppendGrantSharedPrefix(StringInfo buf, GrantStmt *stmt);
extern void AppendGrantSharedSuffix(StringInfo buf, GrantStmt *stmt);

extern void AppendColumnNameList(StringInfo buf, List *columns);

/* Common deparser utils */

typedef struct DefElemOptionFormat
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9 changes: 9 additions & 0 deletions src/test/regress/expected/alter_table_add_column.out
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,15 @@ ERROR: cannot execute ADD COLUMN command with PRIMARY KEY, UNIQUE, FOREIGN and
DETAIL: Adding a column with a constraint in one command is not supported because all constraints in Citus must have explicit names
HINT: You can issue each command separately such as ALTER TABLE referencing ADD COLUMN test_8 data_type; ALTER TABLE referencing ADD CONSTRAINT constraint_name CHECK (check_expression);
ALTER TABLE referencing ADD COLUMN test_8 integer CONSTRAINT check_test_8 CHECK (test_8 > 0);
-- error out properly even if the REFERENCES does not include the column list of the referenced table
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Having the PR description include that this is specific the case we're fixing would be good.

ALTER TABLE referencing ADD COLUMN test_9 bool, ADD COLUMN test_10 int REFERENCES referenced;
ERROR: cannot execute ADD COLUMN command with PRIMARY KEY, UNIQUE, FOREIGN and CHECK constraints
DETAIL: Adding a column with a constraint in one command is not supported because all constraints in Citus must have explicit names
HINT: You can issue each command separately such as ALTER TABLE referencing ADD COLUMN test_10 data_type; ALTER TABLE referencing ADD CONSTRAINT constraint_name FOREIGN KEY (test_10) REFERENCES referenced;
ALTER TABLE referencing ADD COLUMN test_9 bool, ADD COLUMN test_10 int REFERENCES referenced(int_col);
ERROR: cannot execute ADD COLUMN command with PRIMARY KEY, UNIQUE, FOREIGN and CHECK constraints
DETAIL: Adding a column with a constraint in one command is not supported because all constraints in Citus must have explicit names
HINT: You can issue each command separately such as ALTER TABLE referencing ADD COLUMN test_10 data_type; ALTER TABLE referencing ADD CONSTRAINT constraint_name FOREIGN KEY (test_10) REFERENCES referenced (int_col );
-- try to add test_6 again, but with IF NOT EXISTS
ALTER TABLE referencing ADD COLUMN IF NOT EXISTS test_6 text;
NOTICE: column "test_6" of relation "referencing" already exists, skipping
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4 changes: 4 additions & 0 deletions src/test/regress/sql/alter_table_add_column.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,10 @@ ALTER TABLE referencing ADD COLUMN "test_\'!7" "simple_!\'custom_type";
ALTER TABLE referencing ADD COLUMN test_8 integer CHECK (test_8 > 0);
ALTER TABLE referencing ADD COLUMN test_8 integer CONSTRAINT check_test_8 CHECK (test_8 > 0);

-- error out properly even if the REFERENCES does not include the column list of the referenced table
ALTER TABLE referencing ADD COLUMN test_9 bool, ADD COLUMN test_10 int REFERENCES referenced;
ALTER TABLE referencing ADD COLUMN test_9 bool, ADD COLUMN test_10 int REFERENCES referenced(int_col);

-- try to add test_6 again, but with IF NOT EXISTS
ALTER TABLE referencing ADD COLUMN IF NOT EXISTS test_6 text;
ALTER TABLE referencing ADD COLUMN IF NOT EXISTS test_6 integer;
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