Merge pull request #79 from f4lco/table-alias-with-columns
Extend table alias with column renames: "AS tbl(c0, c1)"
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mrks
GitHub
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c7e8309363
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@ -48,7 +48,7 @@
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extern int hsql_debug;
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#endif
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/* "%code requires" blocks. */
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#line 35 "bison_parser.y" /* yacc.c:1915 */
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#line 35 "bison_parser.y" /* yacc.c:1909 */
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// %code requires block
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@ -72,7 +72,7 @@ extern int hsql_debug;
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} \
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}
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#line 76 "bison_parser.h" /* yacc.c:1915 */
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#line 76 "bison_parser.h" /* yacc.c:1909 */
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/* Token type. */
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#ifndef HSQL_TOKENTYPE
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@ -218,7 +218,7 @@ extern int hsql_debug;
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union HSQL_STYPE
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{
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#line 95 "bison_parser.y" /* yacc.c:1915 */
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#line 95 "bison_parser.y" /* yacc.c:1909 */
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double fval;
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int64_t ival;
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@ -247,6 +247,7 @@ union HSQL_STYPE
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hsql::ColumnDefinition* column_t;
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hsql::GroupByDescription* group_t;
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hsql::UpdateClause* update_t;
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hsql::Alias* alias_t;
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std::vector<hsql::SQLStatement*>* stmt_vec;
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@ -257,7 +258,7 @@ union HSQL_STYPE
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std::vector<hsql::Expr*>* expr_vec;
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std::vector<hsql::OrderDescription*>* order_vec;
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#line 261 "bison_parser.h" /* yacc.c:1915 */
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#line 262 "bison_parser.h" /* yacc.c:1909 */
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};
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typedef union HSQL_STYPE HSQL_STYPE;
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@ -120,6 +120,7 @@ int yyerror(YYLTYPE* llocp, SQLParserResult* result, yyscan_t scanner, const cha
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hsql::ColumnDefinition* column_t;
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hsql::GroupByDescription* group_t;
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hsql::UpdateClause* update_t;
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hsql::Alias* alias_t;
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std::vector<hsql::SQLStatement*>* stmt_vec;
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@ -133,7 +134,7 @@ int yyerror(YYLTYPE* llocp, SQLParserResult* result, yyscan_t scanner, const cha
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/*********************************
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** Descrutor symbols
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** Destructor symbols
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*********************************/
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%destructor { } <fval> <ival> <uval> <bval> <order_type>
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%destructor { free( ($$.name) ); free( ($$.schema) ); } <table_name>
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@ -189,7 +190,7 @@ int yyerror(YYLTYPE* llocp, SQLParserResult* result, yyscan_t scanner, const cha
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%type <drop_stmt> drop_statement
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%type <show_stmt> show_statement
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%type <table_name> table_name
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%type <sval> opt_alias alias file_path prepare_target_query
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%type <sval> file_path prepare_target_query
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%type <bval> opt_not_exists opt_exists opt_distinct
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%type <uval> import_file_type opt_join_type column_type
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%type <table> from_clause table_ref table_ref_atomic table_ref_name nonjoin_table_ref_atomic
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@ -205,6 +206,7 @@ int yyerror(YYLTYPE* llocp, SQLParserResult* result, yyscan_t scanner, const cha
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%type <column_t> column_def
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%type <update_t> update_clause
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%type <group_t> opt_group
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%type <alias_t> opt_table_alias table_alias opt_alias alias
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%type <str_vec> ident_commalist opt_column_list
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%type <expr_vec> expr_list select_list literal_list hint_list opt_hints
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@ -735,7 +737,10 @@ literal_list:
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expr_alias:
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expr opt_alias {
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$$ = $1;
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$$->alias = $2;
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if ($2) {
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$$->alias = strdup($2->name);
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delete $2;
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}
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}
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;
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@ -906,7 +911,7 @@ table_ref_atomic:
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nonjoin_table_ref_atomic:
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table_ref_name
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| '(' select_statement ')' opt_alias {
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| '(' select_statement ')' opt_table_alias {
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auto tbl = new TableRef(kTableSelect);
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tbl->select = $2;
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tbl->alias = $4;
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@ -921,7 +926,7 @@ table_ref_commalist:
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table_ref_name:
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table_name opt_alias {
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table_name opt_table_alias {
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auto tbl = new TableRef(kTableName);
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tbl->schema = $1.schema;
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tbl->name = $1.name;
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@ -946,11 +951,23 @@ table_name:
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;
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alias:
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AS IDENTIFIER { $$ = $2; }
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| IDENTIFIER
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table_alias:
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alias
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| AS IDENTIFIER '(' ident_commalist ')' { $$ = new Alias($2, $4); }
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;
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opt_table_alias:
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table_alias
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| /* empty */ { $$ = nullptr; }
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alias:
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AS IDENTIFIER { $$ = new Alias($2); }
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| IDENTIFIER { $$ = new Alias($1); }
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;
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opt_alias:
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alias
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| /* empty */ { $$ = nullptr; }
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@ -1037,4 +1054,3 @@ ident_commalist:
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*********************************/
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/* empty */
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@ -24,6 +24,14 @@ namespace hsql {
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char* name;
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};
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struct Alias {
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Alias(char* name, std::vector<char*>* columns = nullptr);
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~Alias();
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char* name;
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std::vector<char*>* columns;
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};
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// Holds reference to tables. Can be either table names or a select statement.
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struct TableRef {
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TableRef(TableRefType type);
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@ -33,7 +41,7 @@ namespace hsql {
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char* schema;
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char* name;
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char* alias;
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Alias* alias;
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SelectStatement* select;
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std::vector<TableRef*>* list;
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@ -231,6 +231,21 @@ namespace hsql {
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}
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}
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// Alias
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Alias::Alias(char* name, std::vector<char*>* columns) :
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name(name),
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columns(columns) {}
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Alias::~Alias() {
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free(name);
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if (columns) {
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for (char* column : *columns) {
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free(column);
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}
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delete columns;
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}
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}
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// TableRef
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TableRef::TableRef(TableRefType type) :
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type(type),
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@ -244,10 +259,10 @@ namespace hsql {
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TableRef::~TableRef() {
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free(schema);
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free(name);
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free(alias);
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delete select;
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delete join;
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delete alias;
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if (list != nullptr) {
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for (TableRef* table : *list) {
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@ -262,7 +277,7 @@ namespace hsql {
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}
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const char* TableRef::getName() const {
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if (alias != nullptr) return alias;
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if (alias) return alias->name;
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else return name;
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}
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@ -6,6 +6,7 @@
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namespace hsql {
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void printOperatorExpression(Expr* expr, uintmax_t numIndent);
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void printAlias(Alias* alias, uintmax_t numIndent);
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std::string indent(uintmax_t numIndent) {
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return std::string(numIndent, '\t');
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@ -54,9 +55,20 @@ namespace hsql {
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for (TableRef* tbl : *table->list) printTableRefInfo(tbl, numIndent);
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break;
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}
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if (table->alias != nullptr) {
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inprint("Alias", numIndent + 1);
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inprint(table->alias, numIndent + 2);
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if (table->alias) {
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printAlias(table->alias, numIndent);
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}
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}
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void printAlias(Alias* alias, uintmax_t numIndent) {
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inprint("Alias", numIndent + 1);
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inprint(alias->name, numIndent + 2);
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if (alias->columns) {
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for (char* column : *(alias->columns)) {
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inprint(column, numIndent + 3);
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}
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}
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}
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@ -10,3 +10,4 @@
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!INSERT INTO test_table VALUESd (1, 2, 'test');
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!SELECT * FROM t WHERE a = ? AND b = ?;SELECT 1;
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!SHOW COLUMNS;
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!select a + 2 as b(spam, eggs) from B;
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@ -3,6 +3,6 @@ SELECT C_COUNT, COUNT(*) AS CUSTDIST
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FROM (SELECT C_CUSTKEY, COUNT(O_ORDERKEY)
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FROM CUSTOMER left outer join ORDERS on C_CUSTKEY = O_CUSTKEY
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AND O_COMMENT not like '%%special%%requests%%'
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GROUP BY C_CUSTKEY) AS C_ORDERS
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GROUP BY C_CUSTKEY) AS C_ORDERS (C_CUSTKEY, C_COUNT)
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GROUP BY C_COUNT
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ORDER BY CUSTDIST DESC, C_COUNT DESC;
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@ -343,9 +343,55 @@ TEST(SelectColumnOrder) {
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// Make sure the order of the table list is corrects
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ASSERT_STREQ(stmt->fromTable->list->at(0)->name, "a");
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ASSERT_STREQ(stmt->fromTable->list->at(1)->alias, "b");
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ASSERT_STREQ(stmt->fromTable->list->at(2)->alias, "c");
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ASSERT_STREQ(stmt->fromTable->list->at(3)->alias, "d");
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ASSERT_STREQ(stmt->fromTable->list->at(1)->alias->name, "b");
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ASSERT_STREQ(stmt->fromTable->list->at(2)->alias->name, "c");
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ASSERT_STREQ(stmt->fromTable->list->at(3)->alias->name, "d");
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}
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TEST(SelectAliasAbsent) {
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TEST_PARSE_SINGLE_SQL(
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"SELECT * FROM students;",
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kStmtSelect,
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SelectStatement,
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result,
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stmt);
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ASSERT_NULL(stmt->fromTable->alias);
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}
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TEST(SelectAliasSimple) {
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TEST_PARSE_SINGLE_SQL(
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"SELECT * FROM students AS s1;",
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kStmtSelect,
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SelectStatement,
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result,
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stmt);
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Alias* alias = stmt->fromTable->alias;
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ASSERT_NOTNULL(alias);
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ASSERT_STREQ(alias->name, "s1");
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ASSERT_NULL(alias->columns);
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}
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TEST(SelectAliasWithColumns) {
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TEST_PARSE_SINGLE_SQL(
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"SELECT * FROM students AS s1(id, city);",
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kStmtSelect,
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SelectStatement,
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result,
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stmt);
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Alias* alias = stmt->fromTable->alias;
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ASSERT_NOTNULL(alias);
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ASSERT_NOTNULL(alias->name);
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ASSERT_STREQ(alias->name, "s1");
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ASSERT_NOTNULL(alias->columns);
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ASSERT_EQ(alias->columns->size(), 2);
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ASSERT_STREQ(alias->columns->at(0), "id");
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ASSERT_STREQ(alias->columns->at(1), "city");
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}
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TEST(Operators) {
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