diff --git a/core/trino-main/src/test/java/io/trino/connector/TestingTableFunctions.java b/core/trino-main/src/test/java/io/trino/connector/TestingTableFunctions.java
index 4febbe36409a..f9a60c5dcf0b 100644
--- a/core/trino-main/src/test/java/io/trino/connector/TestingTableFunctions.java
+++ b/core/trino-main/src/test/java/io/trino/connector/TestingTableFunctions.java
@@ -253,6 +253,40 @@ public TableFunctionAnalysis analyze(ConnectorSession session, ConnectorTransact
         }
     }
 
+    public static class ThreeTableArgumentsFunction
+            extends AbstractConnectorTableFunction
+    {
+        public ThreeTableArgumentsFunction()
+        {
+            super(
+                    SCHEMA_NAME,
+                    "three_table_arguments_function",
+                    ImmutableList.of(
+                            TableArgumentSpecification.builder()
+                                    .name("INPUT1")
+                                    .build(),
+                            TableArgumentSpecification.builder()
+                                    .name("INPUT2")
+                                    .build(),
+                            TableArgumentSpecification.builder()
+                                    .name("INPUT3")
+                                    .build()),
+                    GENERIC_TABLE);
+        }
+
+        @Override
+        public TableFunctionAnalysis analyze(ConnectorSession session, ConnectorTransactionHandle transaction, Map<String, Argument> arguments)
+        {
+            return TableFunctionAnalysis.builder()
+                    .handle(HANDLE)
+                    .returnedType(new Descriptor(ImmutableList.of(new Descriptor.Field(COLUMN_NAME, Optional.of(BOOLEAN)))))
+                    .requiredColumns("INPUT1", ImmutableList.of(0))
+                    .requiredColumns("INPUT2", ImmutableList.of(0))
+                    .requiredColumns("INPUT3", ImmutableList.of(0))
+                    .build();
+        }
+    }
+
     public static class OnlyPassThroughFunction
             extends AbstractConnectorTableFunction
     {
diff --git a/core/trino-main/src/test/java/io/trino/sql/analyzer/TestAnalyzer.java b/core/trino-main/src/test/java/io/trino/sql/analyzer/TestAnalyzer.java
index fd072332e8a5..0820f1dec73b 100644
--- a/core/trino-main/src/test/java/io/trino/sql/analyzer/TestAnalyzer.java
+++ b/core/trino-main/src/test/java/io/trino/sql/analyzer/TestAnalyzer.java
@@ -32,6 +32,7 @@
 import io.trino.connector.TestingTableFunctions.RequiredColumnsFunction;
 import io.trino.connector.TestingTableFunctions.TableArgumentFunction;
 import io.trino.connector.TestingTableFunctions.TableArgumentRowSemanticsFunction;
+import io.trino.connector.TestingTableFunctions.ThreeTableArgumentsFunction;
 import io.trino.connector.TestingTableFunctions.TwoScalarArgumentsFunction;
 import io.trino.connector.TestingTableFunctions.TwoTableArgumentsFunction;
 import io.trino.execution.DynamicFilterConfig;
@@ -6462,6 +6463,14 @@ public void testCopartitionColumns()
                 """)
                 .hasErrorCode(TYPE_MISMATCH)
                 .hasMessage("line 4:18: Partitioning columns in copartitioned tables have incompatible types");
+
+        analyze("""
+                SELECT * FROM TABLE(system.three_table_arguments_function(
+                    input1 => TABLE(SELECT 1) t1(a) PARTITION BY (a),
+                    input2 => TABLE(SELECT 2) t2(b) PARTITION BY (b),
+                    input3 => TABLE(SELECT 3)
+                    COPARTITION (t1, t2)))
+                """);
     }
 
     @Test
@@ -7040,6 +7049,7 @@ public ConnectorTransactionHandle getConnectorTransaction(TransactionId transact
                         new TableArgumentRowSemanticsFunction(),
                         new DescriptorArgumentFunction(),
                         new TwoTableArgumentsFunction(),
+                        new ThreeTableArgumentsFunction(),
                         new OnlyPassThroughFunction(),
                         new MonomorphicStaticReturnTypeFunction(),
                         new PolymorphicStaticReturnTypeFunction(),
diff --git a/core/trino-parser/src/main/antlr4/io/trino/sql/parser/SqlBase.g4 b/core/trino-parser/src/main/antlr4/io/trino/sql/parser/SqlBase.g4
index 4898866069cc..f071ecf826c2 100644
--- a/core/trino-parser/src/main/antlr4/io/trino/sql/parser/SqlBase.g4
+++ b/core/trino-parser/src/main/antlr4/io/trino/sql/parser/SqlBase.g4
@@ -833,7 +833,7 @@ nonReserved
     // IMPORTANT: this rule must only contain tokens. Nested rules are not supported. See SqlParser.exitNonReserved
     : ABSENT | ADD | ADMIN | AFTER | ALL | ANALYZE | ANY | ARRAY | ASC | AT | AUTHORIZATION
     | BERNOULLI | BOTH
-    | CALL | CASCADE | CATALOGS | COLUMN | COLUMNS | COMMENT | COMMIT | COMMITTED | CONDITIONAL | COPARTITION | COUNT | CURRENT
+    | CALL | CASCADE | CATALOGS | COLUMN | COLUMNS | COMMENT | COMMIT | COMMITTED | CONDITIONAL | COUNT | CURRENT
     | DATA | DATE | DAY | DEFAULT | DEFINE | DEFINER | DENY | DESC | DESCRIPTOR | DISTRIBUTED | DOUBLE
     | EMPTY | ENCODING | ERROR | EXCLUDING | EXPLAIN
     | FETCH | FILTER | FINAL | FIRST | FOLLOWING | FORMAT | FUNCTIONS
diff --git a/docs/src/main/sphinx/language/reserved.rst b/docs/src/main/sphinx/language/reserved.rst
index 0bb6c42c6c80..b4547a0c104e 100644
--- a/docs/src/main/sphinx/language/reserved.rst
+++ b/docs/src/main/sphinx/language/reserved.rst
@@ -17,6 +17,7 @@ Keyword                        SQL:2016      SQL-92
 ``CASE``                       reserved      reserved
 ``CAST``                       reserved      reserved
 ``CONSTRAINT``                 reserved      reserved
+``COPARTITION``
 ``CREATE``                     reserved      reserved
 ``CROSS``                      reserved      reserved
 ``CUBE``                       reserved