Add create and show schema queries

src/query/frontend/ast/ast.lcp

@@ -2665,5 +2665,35 @@ cpp<#
   (:serialize (:slk))
   (:clone))
 
+(lcp:define-class schema-query (query)
+  ((action "Action" :scope :public)
+   (label "LabelIx" :scope :public
+          :slk-load (lambda (member)
+                     #>cpp
+                     slk::Load(&self->${member}, reader, storage);
+                     cpp<#)
+          :clone (lambda (source dest)
+                   #>cpp
+                   ${dest} = storage->GetLabelIx(${source}.name);
+                   cpp<#))
+    (property_name "std::string" :scope :public)
+    (property_type "std::string" :scope :public))
+
+  (:public
+    (lcp:define-enum action
+        (create-schema drop-schema show-schema show-schemas)
+      (:serialize))
+    #>cpp
+    SchemaQuery() = default;
+
+    DEFVISITABLE(QueryVisitor<void>);
+    cpp<#)
+  (:private
+    #>cpp
+    friend class AstStorage;
+    cpp<#)
+  (:serialize (:slk))
+  (:clone))
+
 (lcp:pop-namespace) ;; namespace query
 (lcp:pop-namespace) ;; namespace memgraph

src/query/frontend/ast/ast_visitor.hpp

@@ -94,6 +94,7 @@ class StreamQuery;
 class SettingQuery;
 class VersionQuery;
 class Foreach;
+class SchemaQuery;
 
 using TreeCompositeVisitor = utils::CompositeVisitor<
     SingleQuery, CypherUnion, NamedExpression, OrOperator, XorOperator, AndOperator, NotOperator, AdditionOperator,
@@ -125,9 +126,9 @@ class ExpressionVisitor
           None, ParameterLookup, Identifier, PrimitiveLiteral, RegexMatch> {};
 
 template <class TResult>
-class QueryVisitor
-    : public utils::Visitor<TResult, CypherQuery, ExplainQuery, ProfileQuery, IndexQuery, AuthQuery, InfoQuery,
-                            ConstraintQuery, DumpQuery, ReplicationQuery, LockPathQuery, FreeMemoryQuery, TriggerQuery,
-                            IsolationLevelQuery, CreateSnapshotQuery, StreamQuery, SettingQuery, VersionQuery> {};
+class QueryVisitor : public utils::Visitor<TResult, CypherQuery, ExplainQuery, ProfileQuery, IndexQuery, AuthQuery,
+                                           InfoQuery, ConstraintQuery, DumpQuery, ReplicationQuery, LockPathQuery,
+                                           FreeMemoryQuery, TriggerQuery, IsolationLevelQuery, CreateSnapshotQuery,
+                                           StreamQuery, SettingQuery, VersionQuery, SchemaQuery> {};
 
 }  // namespace memgraph::query

src/query/frontend/ast/cypher_main_visitor.cpp

@@ -2336,6 +2336,11 @@ antlrcpp::Any CypherMainVisitor::visitForeach(MemgraphCypher::ForeachContext *ct
   return for_each;
 }
 
+antlrcpp::Any CypherMainVisitor::visitSchemaQuery(MemgraphCypher::SchemaQueryContext *ctx) {
+  auto *schema_query = ctx->children[0]->accept(this).as<SchemaQuery *>();
+  return schema_query;
+}
+
 LabelIx CypherMainVisitor::AddLabel(const std::string &name) { return storage_->GetLabelIx(name); }
 
 PropertyIx CypherMainVisitor::AddProperty(const std::string &name) { return storage_->GetPropertyIx(name); }

src/query/frontend/ast/cypher_main_visitor.hpp

@@ -849,6 +849,11 @@ class CypherMainVisitor : public antlropencypher::MemgraphCypherBaseVisitor {
    */
   antlrcpp::Any visitForeach(MemgraphCypher::ForeachContext *ctx) override;
 
+  /**
+   * @return Schema*
+   */
+  antlrcpp::Any visitSchemaQuery(MemgraphCypher::SchemaQueryContext *ctx) override;
+
  public:
   Query *query() { return query_; }
   const static std::string kAnonPrefix;

src/query/frontend/opencypher/grammar/MemgraphCypher.g4

@@ -76,6 +76,7 @@ memgraphCypherKeyword : cypherKeyword
                       | ROLE
                       | ROLES
                       | QUOTE
+                      | SCHEMA
                       | SESSION
                       | SETTING
                       | SETTINGS
@@ -122,6 +123,7 @@ query : cypherQuery
       | streamQuery
       | settingQuery
       | versionQuery
+      | schemaQuery
       ;
 
 authQuery : createRole
@@ -192,6 +194,11 @@ settingQuery : setSetting
              | showSettings
              ;
 
+schemaQuery : showSchema
+            | showSchemas
+            | createSchema
+            ;
+
 loadCsv : LOAD CSV FROM csvFile ( WITH | NO ) HEADER
          ( IGNORE BAD ) ?
          ( DELIMITER delimiter ) ?
@@ -254,6 +261,7 @@ privilege : CREATE
           | MODULE_READ
           | MODULE_WRITE
           | WEBSOCKET
+          | SCHEMA
           ;
 
 privilegeList : privilege ( ',' privilege )* ;
@@ -374,3 +382,23 @@ showSetting : SHOW DATABASE SETTING settingName ;
 showSettings : SHOW DATABASE SETTINGS ;
 
 versionQuery : SHOW VERSION ;
+
+showSchema : SHOW SCHEMA ON ':' labelName;
+
+showSchemas : SHOW SCHEMAS;
+
+createSchema : CREATE SCHEMA ON ':' labelName schemaPropertyList;
+
+schemaPropertyList : propertyKeyName propertyType ( ',' propertyKeyName propertyType )* ;
+
+propertyType : BOOL
+             | DATE
+             | DURATION
+             | FLOAT
+             | INTEGER
+             | LIST
+             | LOCALDATETIME
+             | LOCALTIME
+             | MAP
+             | STRING
+             ;

src/query/frontend/opencypher/grammar/MemgraphCypherLexer.g4

@@ -89,6 +89,7 @@ REVOKE              : R E V O K E ;
 ROLE                : R O L E ;
 ROLES               : R O L E S ;
 QUOTE               : Q U O T E ;
+SCHEMA              : S C H E M A ;
 SERVICE_URL         : S E R V I C E UNDERSCORE U R L ;
 SESSION             : S E S S I O N ;
 SETTING             : S E T T I N G ;

src/query/frontend/stripped_lexer_constants.hpp

@@ -204,8 +204,9 @@ const trie::Trie kKeywords = {"union",
                               "pulsar",
                               "service_url",
                               "version",
-                              "websocket"
-                              "foreach"};
+                              "websocket",
+                              "foreach",
+                              "schema"};
 
 // Unicode codepoints that are allowed at the start of the unescaped name.
 const std::bitset<kBitsetSize> kUnescapedNameAllowedStarts(