Support SHOW CREATE MATERIALIZED VIEW

presto-hive/src/test/java/com/facebook/presto/hive/TestHiveIntegrationSmokeTest.java

@@ -5350,9 +5350,28 @@ public void testCreateMaterializedView()
     @Test
     public void testShowCreateOnMaterializedView()
     {
+        String createMaterializedViewSql = formatSqlText(format("CREATE MATERIALIZED VIEW %s.%s.test_customer_mv_1\n" +
+                "WITH (\n" +
+                "   format = 'ORC'," +
+                "   partitioned_by = ARRAY['nationkey']\n" +
+                retentionDays(15) +
+                ") AS SELECT\n" +
+                "  name\n" +
+                ", nationkey\n" +
+                "FROM\n" +
+                "  test_customer_base_1",
+                getSession().getCatalog().get(),
+                getSession().getSchema().get()));
+
         computeActual("CREATE TABLE test_customer_base_1 WITH (partitioned_by = ARRAY['nationkey']) AS SELECT custkey, name, address, nationkey FROM customer LIMIT 10");
-        computeActual("CREATE MATERIALIZED VIEW test_customer_mv_1 WITH (partitioned_by = ARRAY['nationkey']" + retentionDays(30) + ") AS SELECT name, nationkey FROM test_customer_base_1");
+        computeActual(createMaterializedViewSql);
 
+        MaterializedResult actualResult = computeActual("SHOW CREATE MATERIALIZED VIEW test_customer_mv_1");
+        assertEquals(getOnlyElement(actualResult.getOnlyColumnAsSet()), createMaterializedViewSql.trim());
+
+        assertQueryFails(
+                "SHOW CREATE MATERIALIZED VIEW test_customer_base_1",
+                format(".*Relation '%s.%s.test_customer_base_1' is a table, not a materialized view", getSession().getCatalog().get(), getSession().getSchema().get()));
         assertQueryFails(
                 "SHOW CREATE VIEW test_customer_mv_1",
                 format(".*Relation '%s.%s.test_customer_mv_1' is a materialized view, not a view", getSession().getCatalog().get(), getSession().getSchema().get()));

presto-main/src/main/java/com/facebook/presto/sql/rewrite/ShowQueriesRewrite.java

@@ -46,6 +46,7 @@
 import com.facebook.presto.sql.tree.BooleanLiteral;
 import com.facebook.presto.sql.tree.ColumnDefinition;
 import com.facebook.presto.sql.tree.CreateFunction;
+import com.facebook.presto.sql.tree.CreateMaterializedView;
 import com.facebook.presto.sql.tree.CreateTable;
 import com.facebook.presto.sql.tree.CreateView;
 import com.facebook.presto.sql.tree.DoubleLiteral;
@@ -140,6 +141,7 @@
 import static com.facebook.presto.sql.tree.RoutineCharacteristics.Determinism;
 import static com.facebook.presto.sql.tree.RoutineCharacteristics.Language;
 import static com.facebook.presto.sql.tree.RoutineCharacteristics.NullCallClause;
+import static com.facebook.presto.sql.tree.ShowCreate.Type.MATERIALIZED_VIEW;
 import static com.facebook.presto.sql.tree.ShowCreate.Type.TABLE;
 import static com.facebook.presto.sql.tree.ShowCreate.Type.VIEW;
 import static com.google.common.base.Strings.nullToEmpty;
@@ -460,6 +462,36 @@ protected Node visitShowCreate(ShowCreate node, Void context)
                 return singleValueQuery("Create View", sql);
             }
 
+            if (node.getType() == MATERIALIZED_VIEW) {
+                Optional<TableHandle> tableHandle = metadata.getTableHandle(session, objectName);
+
+                if (!materializedViewDefinition.isPresent()) {
+                    if (viewDefinition.isPresent()) {
+                        throw new SemanticException(NOT_SUPPORTED, node, "Relation '%s' is a view, not a materialized view", objectName);
+                    }
+                    if (tableHandle.isPresent()) {
+                        throw new SemanticException(NOT_SUPPORTED, node, "Relation '%s' is a table, not a materialized view", objectName);
+                    }
+                    throw new SemanticException(MISSING_TABLE, node, "Materialized view '%s' does not exist", objectName);
+                }
+
+                Query query = parseView(materializedViewDefinition.get().getOriginalSql(), objectName, node);
+
+                ConnectorTableMetadata connectorTableMetadata = metadata.getTableMetadata(session, tableHandle.get()).getMetadata();
+                Map<String, Object> properties = connectorTableMetadata.getProperties();
+                Map<String, PropertyMetadata<?>> allTableProperties = metadata.getTablePropertyManager().getAllProperties().get(tableHandle.get().getConnectorId());
+                List<Property> propertyNodes = buildProperties(objectName, Optional.empty(), INVALID_TABLE_PROPERTY, properties, allTableProperties);
+
+                CreateMaterializedView createMaterializedView = new CreateMaterializedView(
+                        Optional.empty(),
+                        createQualifiedName(objectName),
+                        query,
+                        false,
+                        propertyNodes,
+                        connectorTableMetadata.getComment());
+                return singleValueQuery("Create Materialized View", formatSql(createMaterializedView, Optional.of(parameters)).trim());
+            }
+
             if (node.getType() == TABLE) {
                 if (viewDefinition.isPresent()) {
                     throw new SemanticException(NOT_SUPPORTED, node, "Relation '%s' is a view, not a table", objectName);

presto-parser/src/main/antlr4/com/facebook/presto/sql/parser/SqlBase.g4

@@ -102,6 +102,7 @@ statement
         ('(' explainOption (',' explainOption)* ')')? statement        #explain
     | SHOW CREATE TABLE qualifiedName                                  #showCreateTable
     | SHOW CREATE VIEW qualifiedName                                   #showCreateView
+    | SHOW CREATE MATERIALIZED VIEW qualifiedName                      #showCreateMaterializedView
     | SHOW CREATE FUNCTION qualifiedName types?                        #showCreateFunction
     | SHOW TABLES ((FROM | IN) qualifiedName)?
         (LIKE pattern=string (ESCAPE escape=string)?)?                 #showTables

presto-parser/src/main/java/com/facebook/presto/sql/SqlFormatter.java

@@ -781,6 +781,10 @@ else if (node.getType() == ShowCreate.Type.VIEW) {
                 builder.append("SHOW CREATE VIEW ")
                         .append(formatName(node.getName()));
             }
+            else if (node.getType() == ShowCreate.Type.MATERIALIZED_VIEW) {
+                builder.append("SHOW CREATE MATERIALIZED VIEW ")
+                        .append(formatName(node.getName()));
+            }
 
             return null;
         }

presto-parser/src/main/java/com/facebook/presto/sql/parser/AstBuilder.java

@@ -944,6 +944,12 @@ public Node visitShowCreateView(SqlBaseParser.ShowCreateViewContext context)
         return new ShowCreate(getLocation(context), ShowCreate.Type.VIEW, getQualifiedName(context.qualifiedName()));
     }
 
+    @Override
+    public Node visitShowCreateMaterializedView(SqlBaseParser.ShowCreateMaterializedViewContext context)
+    {
+        return new ShowCreate(getLocation(context), ShowCreate.Type.MATERIALIZED_VIEW, getQualifiedName(context.qualifiedName()));
+    }
+
     @Override
     public Node visitShowFunctions(SqlBaseParser.ShowFunctionsContext context)
     {

presto-parser/src/main/java/com/facebook/presto/sql/tree/ShowCreate.java

@@ -28,7 +28,8 @@ public class ShowCreate
     public enum Type
     {
         TABLE,
-        VIEW
+        VIEW,
+        MATERIALIZED_VIEW
     }
 
     private final Type type;