usql update

usql/usql_ddl.cpp

@@ -1,6 +1,5 @@
 #include "usql.h"
 #include "exception.h"
-#include "ml_date.h"
 #include "ml_string.h"
 
 #include <algorithm>
@@ -10,7 +9,7 @@ namespace usql {
 
 
 
-std::unique_ptr<Table> USql::execute_create_table(CreateTableNode &node) {
+std::unique_ptr<Table> USql::execute_create_table(const CreateTableNode &node) {
 	check_table_not_exists(node.table_name);
 
 	Table table{node.table_name, node.cols_defs};
@@ -20,7 +19,23 @@ std::unique_ptr<Table> USql::execute_create_table(CreateTableNode &node) {
 }
 
 
-std::unique_ptr<Table> USql::execute_create_table_as_table(CreateTableAsSelectNode &node) {
+std::unique_ptr<Table> USql::execute_create_index(const CreateIndexNode &node) {
+	Table *table_def = find_table(node.table_name);				// throws exception if not found
+	ColDefNode col_def = table_def->get_column_def(node.column_name);	// throws exception if not found
+
+	check_index_not_exists(node.index_name);
+	if (col_def.null) throw Exception("index on not null supported only");
+	if (table_def->get_index_for_column(node.column_name) != nullptr) throw Exception("column is already indexed");
+
+	table_def->create_index({node.index_name, node.column_name, col_def.type});
+
+	table_def->index_rows(node.index_name);
+
+	return create_stmt_result_table(0, "index created", 0);
+}
+
+
+std::unique_ptr<Table> USql::execute_create_table_as_table(const CreateTableAsSelectNode &node) {
 	check_table_not_exists(node.table_name);
 
 	auto select = execute_select((SelectFromTableNode &) *node.select_table);
@@ -43,7 +58,7 @@ std::unique_ptr<Table> USql::execute_create_table_as_table(CreateTableAsSelectNo
 
 
 
-std::unique_ptr<Table> USql::execute_drop(DropTableNode &node) {
+std::unique_ptr<Table> USql::execute_drop(const DropTableNode &node) {
 	auto name_cmp = [node](const Table& t) { return t.m_name == node.table_name; };
 
 	auto table_def = std::find_if(begin(m_tables), end(m_tables), name_cmp);
@@ -55,12 +70,12 @@ std::unique_ptr<Table> USql::execute_drop(DropTableNode &node) {
 	throw Exception("table not found (" + node.table_name + ")");
 }
 
-std::unique_ptr<Table> USql::execute_set(SetNode &node) {
+std::unique_ptr<Table> USql::execute_set(const SetNode &node) {
 	Settings::set_setting(node.name, node.value);
 	return create_stmt_result_table(0, "set succeeded", 1);
 }
 
-std::unique_ptr<Table> USql::execute_show(ShowNode &node) {
+std::unique_ptr<Table> USql::execute_show(const ShowNode &node) {
 	std::string value = Settings::get_setting(node.name);
 	return create_stmt_result_table(0, "show succeeded: " + value, 1);
 }
@@ -70,7 +85,7 @@ std::unique_ptr<Table> USql::create_stmt_result_table(long code, const std::stri
 	std::vector<ColDefNode> result_tbl_col_defs{};
 	result_tbl_col_defs.emplace_back("code", ColumnType::integer_type, 0, 1, false);
 	result_tbl_col_defs.emplace_back("desc", ColumnType::varchar_type, 1, 48, false);
-	result_tbl_col_defs.emplace_back("affected_rows", ColumnType::integer_type, 0, 1, true);
+	result_tbl_col_defs.emplace_back("aff_rows", ColumnType::integer_type, 0, 1, true);
 
 	auto table_def = std::make_unique<Table>("result", result_tbl_col_defs);
 
@@ -85,7 +100,7 @@ std::unique_ptr<Table> USql::create_stmt_result_table(long code, const std::stri
 
 
 
-std::unique_ptr<Table> USql::execute_load(LoadIntoTableNode &node) {
+std::unique_ptr<Table> USql::execute_load(const LoadIntoTableNode &node) {
 	// find source table
 	Table *table_def = find_table(node.table_name);
 
@@ -101,7 +116,7 @@ std::unique_ptr<Table> USql::execute_load(LoadIntoTableNode &node) {
 }
 
 
-std::unique_ptr<Table> USql::execute_save(SaveTableNode &node) {
+std::unique_ptr<Table> USql::execute_save(const SaveTableNode &node) {
 	// find source table
 	Table *table_def = find_table(node.table_name);