feat: add struct and list data type (#277)

* feat: add struct and list data type

* type extensions

* feat: extend column type

* chore: rename fields

* add value enum item

* feat: add value

* refactor: item->items

* feat: use single ListValue/StructValue for Row and Column

proto/greptime/v1/column.proto

@@ -17,6 +17,7 @@ syntax = "proto3";
 package greptime.v1;
 
 import "greptime/v1/common.proto";
+import "greptime/v1/row.proto";
 
 option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1";
 option java_outer_classname = "Columns";
@@ -58,7 +59,11 @@ message Column {
     repeated int64 interval_day_time_values = 25;
     repeated IntervalMonthDayNano interval_month_day_nano_values = 26;
     repeated Decimal128 decimal128_values = 31;
+
+    repeated ListValue list_values = 40;
+    repeated StructValue struct_values = 41;
   }
+
   // The array of non-null values in this column.
   //
   // For example: suppose there is a column "foo" that contains some int32

proto/greptime/v1/common.proto

@@ -151,6 +151,8 @@ enum ColumnDataType {
   DECIMAL128 = 30;
   JSON = 31;
   VECTOR = 32;
+  LIST = 40;
+  STRUCT = 41;
 }
 
 message IntervalMonthDayNano {
@@ -185,6 +187,12 @@ message Decimal128 {
   int64 lo = 2;
 }
 
+message StructField {
+  string name = 1;
+  ColumnDataType datatype = 2;
+  ColumnDataTypeExtension datatype_extension = 3;
+}
+
 // Type extension for some complex types
 message ColumnDataTypeExtension {
   oneof type_ext {
@@ -192,6 +200,8 @@ message ColumnDataTypeExtension {
     // Marks the binary column in proto is actually a JSON column.
     JsonTypeExtension json_type = 2;
     VectorTypeExtension vector_type = 3;
+    ListTypeExtension list_type = 4;
+    StructTypeExtension struct_type = 5;
   }
 }
 
@@ -208,6 +218,15 @@ message VectorTypeExtension {
   uint32 dim = 1;
 }
 
+message ListTypeExtension {
+  ColumnDataType datatype = 1;
+  ColumnDataTypeExtension datatype_extension = 2;
+}
+
+message StructTypeExtension {
+  repeated StructField fields = 1;
+}
+
 // Additional options for the column.
 message ColumnOptions {
   // Supported keys:

proto/greptime/v1/row.proto

@@ -76,5 +76,16 @@ message Value {
     int64 interval_day_time_value = 25;
     IntervalMonthDayNano interval_month_day_nano_value = 26;
     Decimal128 decimal128_value = 31;
+
+    ListValue list_value = 40;
+    StructValue struct_value = 41;
   }
 }
+
+message ListValue {
+  repeated Value items = 1;
+}
+
+message StructValue {
+  repeated Value items = 2;
+}