kuzudb · Riolku · Sep 13, 2023 · Sep 7, 2023
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.11)
 
-project(Kuzu VERSION 0.0.8.6 LANGUAGES CXX)
+project(Kuzu VERSION 0.0.8.7 LANGUAGES CXX)
 
 find_package(Threads REQUIRED)
 

diff --git a/src/antlr4/Cypher.g4 b/src/antlr4/Cypher.g4
@@ -24,6 +24,7 @@ oC_Statement
         | kU_CopyTO
         | kU_StandaloneCall
         | kU_CreateMacro
+        | kU_CommentOn
         | kU_Transaction ;
 
 kU_CopyFrom
@@ -40,6 +41,11 @@ kU_StandaloneCall
 
 CALL : ( 'C' | 'c' ) ( 'A' | 'a' ) ( 'L' | 'l' ) ( 'L' | 'l' ) ;
 
+kU_CommentOn
+    : COMMENT SP ON SP TABLE SP oC_SchemaName SP IS SP StringLiteral ;
+
+COMMENT : ( 'C' | 'c' ) ( 'O' | 'o' ) ( 'M' | 'm' ) ( 'M' | 'm' ) ( 'E' | 'e' ) ( 'N' | 'n' ) ( 'T' | 't' ) ;
+
 kU_CreateMacro
     : CREATE SP MACRO SP oC_FunctionName SP? '(' SP? kU_PositionalArgs? SP? kU_DefaultArg? ( SP? ',' SP? kU_DefaultArg )* SP? ')' SP AS SP oC_Expression ;
 
@@ -667,8 +673,12 @@ oC_SymbolicName
     : UnescapedSymbolicName
         | EscapedSymbolicName {if ($EscapedSymbolicName.text == "``") { notifyEmptyToken($EscapedSymbolicName); }}
         | HexLetter
+        | kU_NonReservedKeywords
         ;
 
+kU_NonReservedKeywords
+    : COMMENT ;
+
 UnescapedSymbolicName
     : IdentifierStart ( IdentifierPart )* ;
 

diff --git a/src/binder/bind/CMakeLists.txt b/src/binder/bind/CMakeLists.txt
@@ -1,16 +1,17 @@
 add_library(
         kuzu_binder_bind
         OBJECT
-        bind_standalone_call.cpp
-        bind_transaction.cpp
-        bind_create_macro.cpp
+        bind_comment_on.cpp
         bind_copy.cpp
+        bind_create_macro.cpp
         bind_ddl.cpp
         bind_explain.cpp
         bind_graph_pattern.cpp
         bind_projection_clause.cpp
         bind_query.cpp
         bind_reading_clause.cpp
+        bind_standalone_call.cpp
+        bind_transaction.cpp
         bind_updating_clause.cpp)
 
 set(ALL_OBJECT_FILES

diff --git a/src/binder/bind/bind_comment_on.cpp b/src/binder/bind/bind_comment_on.cpp
@@ -0,0 +1,21 @@
+#include "binder/binder.h"
+#include "binder/bound_comment_on.h"
+#include "parser/comment_on.h"
+
+namespace kuzu {
+namespace binder {
+
+std::unique_ptr<BoundStatement> Binder::bindCommentOn(const parser::Statement& statement) {
+    auto& commentOnStatement = reinterpret_cast<const parser::CommentOn&>(statement);
+    auto tableName = commentOnStatement.getTable();
+    auto comment = commentOnStatement.getComment();
+
+    validateTableExist(tableName);
+    auto catalogContent = catalog.getReadOnlyVersion();
+    auto tableID = catalogContent->getTableID(tableName);
+
+    return std::make_unique<BoundCommentOn>(tableID, tableName, comment);
+}
+
+} // namespace binder
+} // namespace kuzu
diff --git a/src/binder/binder.cpp b/src/binder/binder.cpp
@@ -45,6 +45,9 @@ std::unique_ptr<BoundStatement> Binder::bind(const Statement& statement) {
     case StatementType::STANDALONE_CALL: {
         boundStatement = bindStandaloneCall(statement);
     } break;
+    case StatementType::COMMENT_ON: {
+        boundStatement = bindCommentOn(statement);
+    } break;
     case StatementType::EXPLAIN: {
         boundStatement = bindExplain(statement);
     } break;

diff --git a/src/binder/bound_statement_visitor.cpp b/src/binder/bound_statement_visitor.cpp
@@ -37,6 +37,9 @@ void BoundStatementVisitor::visit(const kuzu::binder::BoundStatement& statement)
     case StatementType::STANDALONE_CALL: {
         visitStandaloneCall(statement);
     } break;
+    case StatementType::COMMENT_ON: {
+        visitCommentOn(statement);
+    } break;
     case StatementType::EXPLAIN: {
         visitExplain(statement);
     } break;

diff --git a/src/catalog/catalog.cpp b/src/catalog/catalog.cpp
@@ -147,5 +147,10 @@ void Catalog::addScalarMacroFunction(
     catalogContentForWriteTrx->addScalarMacroFunction(std::move(name), std::move(macro));
 }
 
+void Catalog::setTableComment(table_id_t tableID, const std::string& comment) {
+    initCatalogContentForWriteTrxIfNecessary();
+    catalogContentForWriteTrx->getTableSchema(tableID)->setComment(comment);
+}
+
 } // namespace catalog
 } // namespace kuzu
diff --git a/src/catalog/catalog_content.cpp b/src/catalog/catalog_content.cpp
@@ -129,6 +129,14 @@ Property* CatalogContent::getRelProperty(
     throw CatalogException("Cannot find rel property " + propertyName + ".");
 }
 
+std::vector<TableSchema*> CatalogContent::getTableSchemas() const {
+    std::vector<TableSchema*> allTableSchemas;
+    for (auto&& [_, schema] : tableSchemas) {
+        allTableSchemas.push_back(schema.get());
+    }
+    return allTableSchemas;
+}
+
 void CatalogContent::dropTableSchema(table_id_t tableID) {
     auto tableName = getTableName(tableID);
     tableNameToIDMap.erase(tableName);

diff --git a/src/catalog/table_schema.cpp b/src/catalog/table_schema.cpp
@@ -73,6 +73,7 @@ void TableSchema::serialize(FileInfo* fileInfo, uint64_t& offset) {
     SerDeser::serializeValue(tableID, fileInfo, offset);
     SerDeser::serializeValue(tableType, fileInfo, offset);
     SerDeser::serializeVectorOfPtrs(properties, fileInfo, offset);
+    SerDeser::serializeValue(comment, fileInfo, offset);
     SerDeser::serializeValue(nextPropertyID, fileInfo, offset);
     serializeInternal(fileInfo, offset);
 }
@@ -82,11 +83,13 @@ std::unique_ptr<TableSchema> TableSchema::deserialize(FileInfo* fileInfo, uint64
     table_id_t tableID;
     TableType tableType;
     std::vector<std::unique_ptr<Property>> properties;
+    std::string comment;
     property_id_t nextPropertyID;
     SerDeser::deserializeValue(tableName, fileInfo, offset);
     SerDeser::deserializeValue(tableID, fileInfo, offset);
     SerDeser::deserializeValue(tableType, fileInfo, offset);
     SerDeser::deserializeVectorOfPtrs(properties, fileInfo, offset);
+    SerDeser::deserializeValue(comment, fileInfo, offset);
     SerDeser::deserializeValue(nextPropertyID, fileInfo, offset);
     std::unique_ptr<TableSchema> result;
     switch (tableType) {
@@ -110,6 +113,7 @@ std::unique_ptr<TableSchema> TableSchema::deserialize(FileInfo* fileInfo, uint64
     result->tableID = tableID;
     result->tableType = tableType;
     result->properties = std::move(properties);
+    result->comment = std::move(comment);
     result->nextPropertyID = nextPropertyID;
     return result;
 }

diff --git a/src/function/built_in_table_functions.cpp b/src/function/built_in_table_functions.cpp
@@ -12,6 +12,7 @@ void BuiltInTableFunctions::registerTableFunctions() {
     tableFunctions.insert({TABLE_INFO_FUNC_NAME, TableInfoFunction::getDefinitions()});
     tableFunctions.insert({DB_VERSION_FUNC_NAME, DBVersionFunction::getDefinitions()});
     tableFunctions.insert({CURRENT_SETTING_FUNC_NAME, CurrentSettingFunction::getDefinitions()});
+    tableFunctions.insert({SHOW_TABLES_FUNC_NAME, ShowTablesFunction::getDefinitions()});
 }
 
 TableFunctionDefinition* BuiltInTableFunctions::mathTableFunction(const std::string& name) {

diff --git a/src/function/table_functions.cpp b/src/function/table_functions.cpp
@@ -97,5 +97,46 @@ std::unique_ptr<TableFuncBindData> CurrentSettingFunction::bindFunc(main::Client
         std::move(returnTypes), std::move(returnColumnNames), 1 /* one row result */);
 }
 
+void ShowTablesFunction::tableFunc(std::pair<offset_t, offset_t> morsel,
+    function::TableFuncBindData* bindData, std::vector<ValueVector*> outputVectors) {
+    auto tables = reinterpret_cast<function::ShowTablesBindData*>(bindData)->tables;
+    auto numTablesToOutput = morsel.second - morsel.first;
+    for (auto i = 0u; i < numTablesToOutput; i++) {
+        auto tableSchema = tables[morsel.first + i];
+        outputVectors[0]->setValue(i, tableSchema->tableName);
+
+        std::string typeString;
+        switch (tableSchema->tableType) {
+        case TableType::NODE: {
+            typeString = "NODE";
+        } break;
+        case TableType::REL: {
+            typeString = "REL";
+        } break;
+        case TableType::RDF: {
+            typeString = "RDF";
+        } break;
+        };
+        outputVectors[1]->setValue(i, typeString);
+        outputVectors[2]->setValue(i, tableSchema->comment);
+    }
+    outputVectors[0]->state->selVector->selectedSize = numTablesToOutput;
+}
+
+std::unique_ptr<TableFuncBindData> ShowTablesFunction::bindFunc(main::ClientContext* context,
+    kuzu::function::TableFuncBindInput input, catalog::CatalogContent* catalog) {
+    std::vector<std::string> returnColumnNames;
+    std::vector<LogicalType> returnTypes;
+    returnColumnNames.emplace_back("TableName");
+    returnTypes.emplace_back(LogicalTypeID::STRING);
+    returnColumnNames.emplace_back("TableType");
+    returnTypes.emplace_back(LogicalTypeID::STRING);
+    returnColumnNames.emplace_back("TableComment");
+    returnTypes.emplace_back(LogicalTypeID::STRING);
+
+    return std::make_unique<ShowTablesBindData>(catalog->getTableSchemas(), std::move(returnTypes),
+        std::move(returnColumnNames), catalog->getTableCount());
+}
+
 } // namespace function
 } // namespace kuzu
diff --git a/src/include/binder/binder.h b/src/include/binder/binder.h
@@ -133,6 +133,9 @@ class Binder {
     /*** bind transaction ***/
     std::unique_ptr<BoundStatement> bindTransaction(const parser::Statement& statement);
 
+    /*** bind comment on ***/
+    std::unique_ptr<BoundStatement> bindCommentOn(const parser::Statement& statement);
+
     /*** bind explain ***/
     std::unique_ptr<BoundStatement> bindExplain(const parser::Statement& statement);
 

diff --git a/src/include/binder/bound_comment_on.h b/src/include/binder/bound_comment_on.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include "bound_statement_result.h"
+#include "common/statement_type.h"
+
+namespace kuzu {
+namespace binder {
+
+class BoundCommentOn : public BoundStatement {
+public:
+    BoundCommentOn(common::table_id_t tableID, std::string tableName, std::string comment)
+        : BoundStatement{common::StatementType::COMMENT_ON,
+              BoundStatementResult::createSingleStringColumnResult()},
+          tableID(tableID), tableName(std::move(tableName)), comment(std::move(comment)) {}
+
+    inline common::table_id_t getTableID() const { return tableID; }
+    inline std::string getTableName() const { return tableName; }
+    inline std::string getComment() const { return comment; }
+
+private:
+    common::table_id_t tableID;
+    std::string tableName, comment;
+};
+
+} // namespace binder
+} // namespace kuzu
diff --git a/src/include/binder/bound_statement_visitor.h b/src/include/binder/bound_statement_visitor.h
@@ -26,6 +26,7 @@ class BoundStatementVisitor {
     virtual void visitRenameProperty(const BoundStatement& statement) {}
     virtual void visitCopy(const BoundStatement& statement) {}
     virtual void visitStandaloneCall(const BoundStatement& statement) {}
+    virtual void visitCommentOn(const BoundStatement& statement) {}
     virtual void visitExplain(const BoundStatement& statement);
     virtual void visitCreateMacro(const BoundStatement& statement) {}
     virtual void visitTransaction(const BoundStatement& statement) {}

diff --git a/src/include/binder/visitor/statement_read_write_analyzer.h b/src/include/binder/visitor/statement_read_write_analyzer.h
@@ -12,14 +12,15 @@ class StatementReadWriteAnalyzer : public BoundStatementVisitor {
     bool isReadOnly(const BoundStatement& statement);
 
 private:
-    void visitCreateTable(const BoundStatement& statement) override { readOnly = false; }
-    void visitDropTable(const BoundStatement& statement) override { readOnly = false; }
-    void visitRenameTable(const BoundStatement& statement) override { readOnly = false; }
     void visitAddProperty(const BoundStatement& statement) override { readOnly = false; }
-    void visitDropProperty(const BoundStatement& statement) override { readOnly = false; }
-    void visitRenameProperty(const BoundStatement& statement) override { readOnly = false; }
+    void visitCommentOn(const BoundStatement& statement) override { readOnly = false; }
     void visitCopy(const BoundStatement& statement) override { readOnly = false; }
     void visitCreateMacro(const BoundStatement& statement) override { readOnly = false; }
+    void visitCreateTable(const BoundStatement& statement) override { readOnly = false; }
+    void visitDropProperty(const BoundStatement& statement) override { readOnly = false; }
+    void visitDropTable(const BoundStatement& statement) override { readOnly = false; }
+    void visitRenameProperty(const BoundStatement& statement) override { readOnly = false; }
+    void visitRenameTable(const BoundStatement& statement) override { readOnly = false; }
     void visitQueryPart(const NormalizedQueryPart& queryPart) final;
 
 private:

diff --git a/src/include/catalog/catalog.h b/src/include/catalog/catalog.h
@@ -74,6 +74,8 @@ class Catalog {
     void addScalarMacroFunction(
         std::string name, std::unique_ptr<function::ScalarMacroFunction> macro);
 
+    void setTableComment(common::table_id_t tableID, const std::string& comment);
+
     // TODO(Ziyi): pass transaction pointer here.
     inline function::ScalarMacroFunction* getScalarMacroFunction(const std::string& name) const {
         return catalogContentForReadOnlyTrx->macros.at(name).get();

diff --git a/src/include/catalog/catalog_content.h b/src/include/catalog/catalog_content.h
@@ -74,6 +74,7 @@ class CatalogContent {
         assert(tableSchemas.contains(tableID));
         return tableSchemas.at(tableID)->getProperties();
     }
+    inline uint64_t getTableCount() const { return tableSchemas.size(); }
     inline std::vector<common::table_id_t> getNodeTableIDs() const {
         return getTableIDs(common::TableType::NODE);
     }
@@ -87,6 +88,8 @@ class CatalogContent {
         return getTableSchemas(common::TableType::REL);
     }
 
+    std::vector<TableSchema*> getTableSchemas() const;
+
     inline bool containMacro(const std::string& macroName) const {
         return macros.contains(macroName);
     }

diff --git a/src/include/catalog/node_table_schema.h b/src/include/catalog/node_table_schema.h
@@ -20,12 +20,12 @@ class NodeTableSchema : public TableSchema {
               std::move(properties)},
           primaryKeyPropertyID{primaryPropertyId} {}
     NodeTableSchema(std::string tableName, common::table_id_t tableID,
-        std::vector<std::unique_ptr<Property>> properties, common::property_id_t nextPropertyID,
-        common::property_id_t primaryKeyPropertyID,
+        std::vector<std::unique_ptr<Property>> properties, std::string comment,
+        common::property_id_t nextPropertyID, common::property_id_t primaryKeyPropertyID,
         std::unordered_set<common::table_id_t> fwdRelTableIDSet,
         std::unordered_set<common::table_id_t> bwdRelTableIDSet)
         : TableSchema{common::TableType::NODE, std::move(tableName), tableID, std::move(properties),
-              nextPropertyID},
+              std::move(comment), nextPropertyID},
           primaryKeyPropertyID{primaryKeyPropertyID}, fwdRelTableIDSet{std::move(fwdRelTableIDSet)},
           bwdRelTableIDSet{std::move(bwdRelTableIDSet)} {}
 
@@ -42,13 +42,14 @@ class NodeTableSchema : public TableSchema {
     inline const std::unordered_set<common::table_id_t>& getFwdRelTableIDSet() const {
         return fwdRelTableIDSet;
     }
+
     inline const std::unordered_set<common::table_id_t>& getBwdRelTableIDSet() const {
         return bwdRelTableIDSet;
     }
 
     inline std::unique_ptr<TableSchema> copy() const override {
         return std::make_unique<NodeTableSchema>(tableName, tableID, Property::copy(properties),
-            nextPropertyID, primaryKeyPropertyID, fwdRelTableIDSet, bwdRelTableIDSet);
+            comment, nextPropertyID, primaryKeyPropertyID, fwdRelTableIDSet, bwdRelTableIDSet);
     }
 
 private:

diff --git a/src/include/catalog/rel_table_schema.h b/src/include/catalog/rel_table_schema.h
@@ -30,12 +30,13 @@ class RelTableSchema : public TableSchema {
           relMultiplicity{relMultiplicity}, srcTableID{srcTableID}, dstTableID{dstTableID},
           srcPKDataType{std::move(srcPKDataType)}, dstPKDataType{std::move(dstPKDataType)} {}
     RelTableSchema(std::string tableName, common::table_id_t tableID,
-        std::vector<std::unique_ptr<Property>> properties, common::property_id_t nextPropertyID,
-        RelMultiplicity relMultiplicity, common::table_id_t srcTableID,
-        common::table_id_t dstTableID, std::unique_ptr<common::LogicalType> srcPKDataType,
+        std::vector<std::unique_ptr<Property>> properties, std::string comment,
+        common::property_id_t nextPropertyID, RelMultiplicity relMultiplicity,
+        common::table_id_t srcTableID, common::table_id_t dstTableID,
+        std::unique_ptr<common::LogicalType> srcPKDataType,
         std::unique_ptr<common::LogicalType> dstPKDataType)
         : TableSchema{common::TableType::REL, std::move(tableName), tableID, std::move(properties),
-              nextPropertyID},
+              std::move(comment), nextPropertyID},
           relMultiplicity{relMultiplicity}, srcTableID{srcTableID}, dstTableID{dstTableID},
           srcPKDataType{std::move(srcPKDataType)}, dstPKDataType{std::move(dstPKDataType)} {}
 
@@ -73,7 +74,7 @@ class RelTableSchema : public TableSchema {
 
     inline std::unique_ptr<TableSchema> copy() const override {
         return std::make_unique<RelTableSchema>(tableName, tableID, Property::copy(properties),
-            nextPropertyID, relMultiplicity, srcTableID, dstTableID, srcPKDataType->copy(),
+            comment, nextPropertyID, relMultiplicity, srcTableID, dstTableID, srcPKDataType->copy(),
             dstPKDataType->copy());
     }