add materialized view feature to opengauss

src/include/nodes/makefuncs.h

@@ -71,6 +71,7 @@ extern Node* makeTidConst(ItemPointer item);
 extern FuncCall* makeFuncCall(List* funcname, List* args, int location);
 extern Param* makeParam(
     ParamKind paramkind, int paramid, Oid paramtype, int32 paramtypmod, Oid paramcollid, int location);
+extern ColumnDef* makeColumnDef(const char* colname, Oid typeOid, int32 typmod, Oid collOid);
 extern IndexInfo* makeIndexInfo(int numattrs, List *expressions, List *predicates,
     bool unique, bool isready, bool concurrent);
 #endif /* MAKEFUNC_H */

src/include/nodes/nodes.h

@@ -452,6 +452,7 @@ typedef enum NodeTag {
     T_DropDirectoryStmt,
     T_CreateRlsPolicyStmt,
     T_AlterRlsPolicyStmt,
+    T_RefreshMatViewStmt,
     T_AlterSystemStmt,
 
     /*

src/include/nodes/parsenodes.h

@@ -1406,6 +1406,7 @@ typedef enum ObjectType {
     OBJECT_INTERNAL_PARTITION,
     OBJECT_LANGUAGE,
     OBJECT_LARGEOBJECT,
+    OBJECT_MATVIEW,
     OBJECT_OPCLASS,
     OBJECT_OPERATOR,
     OBJECT_OPFAMILY,
@@ -3291,6 +3292,9 @@ typedef struct ExplainStmt {
  * A query written as SELECT ... INTO will be transformed to this form during
  * parse analysis.
  *
+ * A query written as CREATE MATERIALIZED view will produce this node type,
+ * during parse analysis, since it needs all the same data.
+ *
  * The "query" field is handled similarly to EXPLAIN, though note that it
  * can be a SELECT or an EXECUTE, but not other DML statements.
  * ----------------------
@@ -3299,6 +3303,7 @@ typedef struct CreateTableAsStmt {
     NodeTag type;
     Node* query;         /* the query (see comments above) */
     IntoClause* into;    /* destination table */
+    ObjectType relkind; /* OBJECT_TABLE or OBJECT_MATVIEW */
     bool is_select_into; /* it was written as SELECT INTO */
 #ifdef PGXC
     void* parserSetup;
@@ -3306,6 +3311,17 @@ typedef struct CreateTableAsStmt {
 #endif
 } CreateTableAsStmt;
 
+/* ----------------------
+ *     REFRESH MATERIALIZED VIEW Statement
+ * ----------------------
+ */
+typedef struct RefreshMatViewStmt
+{
+    NodeTag     type;
+    bool        skipData;       /* true for WITH NO DATA */
+    RangeVar   *relation;       /* relation to insert into */
+} RefreshMatViewStmt;
+
 /* ----------------------
  * Checkpoint Statement
  * ----------------------
@@ -3352,7 +3368,7 @@ typedef struct ConstraintsSetStmt {
  */
 typedef struct ReindexStmt {
     NodeTag type;
-    ObjectType kind;    /* OBJECT_INDEX, OBJECT_TABLE, OBJECT_INTERNAL, OBJECT_DATABASE */
+    ObjectType kind;    /* OBJECT_INDEX, OBJECT_TABLE, OBJECT_INTERNAL, etc */
     RangeVar* relation; /* Table or index to reindex */
     const char* name;   /* name of database to reindex */
     bool do_system;     /* include system tables in database case */

src/include/nodes/primnodes.h

@@ -93,7 +93,11 @@ typedef struct RangeVar {
 } RangeVar;
 
 /*
- * IntoClause - target information for SELECT INTO and CREATE TABLE AS
+ * IntoClause - target information for SELECT INTO, CREATE MATERIALIZED VIEW and CREATE TABLE AS
+ * 
+ * For CREATE MATERIALIZED VIEW, viewQuery is the parsed-but-not-rewritten
+ * SELECT Query for the view; otherwise it's NULL.  (Although it's actually
+ * Query*, we declare it as Node* to avoid a forward reference.)
  */
 typedef struct IntoClause {
     NodeTag type;
@@ -104,6 +108,7 @@ typedef struct IntoClause {
     OnCommitAction onCommit; /* what do we do at COMMIT? */
     int8 row_compress;       /* row compression flag */
     char* tableSpaceName;    /* table space to use, or NULL */
+    Node* viewQuery;          /* materialized view's SELECT query */
     bool skipData;           /* true for WITH NO DATA */
 #ifdef PGXC
     struct DistributeBy* distributeby; /* distribution to use, or NULL */