diff --git a/debezium-ddl-parser/src/main/antlr4/io/debezium/ddl/parser/mysql/generated/MySqlParser.g4 b/debezium-ddl-parser/src/main/antlr4/io/debezium/ddl/parser/mysql/generated/MySqlParser.g4
index 9cd2c852c..f24e5ff5f 100644
--- a/debezium-ddl-parser/src/main/antlr4/io/debezium/ddl/parser/mysql/generated/MySqlParser.g4
+++ b/debezium-ddl-parser/src/main/antlr4/io/debezium/ddl/parser/mysql/generated/MySqlParser.g4
@@ -591,13 +591,13 @@ alterView
 
 alterSpecification
     : tableOption (','? tableOption)*                               #alterByTableOption
-    | ADD COLUMN? uid columnDefinition (FIRST | AFTER uid)?         #alterByAddColumn
+    | ADD COLUMN? ifNotExists? uid columnDefinition (FIRST | AFTER uid)?         #alterByAddColumn // ifNotExists is MariaDB-specific
     | ADD COLUMN?
         '('
           uid columnDefinition ( ',' uid columnDefinition)*
         ')'                                                         #alterByAddColumns
-    | ADD indexFormat=(INDEX | KEY) uid? indexType?
-      indexColumnNames indexOption*                                 #alterByAddIndex
+    | ADD indexFormat=(INDEX | KEY) ifNotExists? uid? indexType?
+      indexColumnNames indexOption*                                 #alterByAddIndex // ifNotExists is MariaDB-specific
     | ADD (CONSTRAINT name=uid?)? PRIMARY KEY index=uid?
       indexType? indexColumnNames indexOption*                      #alterByAddPrimaryKey
     | ADD (CONSTRAINT name=uid?)? UNIQUE
@@ -606,20 +606,20 @@ alterSpecification
     | ADD keyType=(FULLTEXT | SPATIAL)
       indexFormat=(INDEX | KEY)? uid?
       indexColumnNames indexOption*                                 #alterByAddSpecialIndex
-    | ADD (CONSTRAINT name=uid?)? FOREIGN KEY
-      indexName=uid? indexColumnNames referenceDefinition           #alterByAddForeignKey
+    | ADD (CONSTRAINT name=uid?)? FOREIGN KEY ifNotExists?
+      indexName=uid? indexColumnNames referenceDefinition           #alterByAddForeignKey // ifNotExists is MariaDB-specific
     | ADD (CONSTRAINT name=uid?)? CHECK '(' expression ')'          #alterByAddCheckTableConstraint
     | ALGORITHM '='? algType=(DEFAULT | INSTANT | INPLACE | COPY)   #alterBySetAlgorithm
     | ALTER COLUMN? uid
       (SET DEFAULT defaultValue | DROP DEFAULT)                     #alterByChangeDefault
-    | CHANGE COLUMN? oldColumn=uid
+    | CHANGE COLUMN? ifExists? oldColumn=uid
       newColumn=uid columnDefinition
-      (FIRST | AFTER afterColumn=uid)?                              #alterByChangeColumn
+      (FIRST | AFTER afterColumn=uid)?                              #alterByChangeColumn // ifExists is MariaDB-specific
     | RENAME COLUMN oldColumn=uid TO newColumn=uid                  #alterByRenameColumn
     | LOCK '='? lockType=(DEFAULT | NONE | SHARED | EXCLUSIVE)      #alterByLock
-    | MODIFY COLUMN?
-      uid columnDefinition (FIRST | AFTER uid)?                     #alterByModifyColumn
-    | DROP COLUMN? uid RESTRICT?                                    #alterByDropColumn
+    | MODIFY COLUMN? ifExists?
+      uid columnDefinition (FIRST | AFTER uid)?                     #alterByModifyColumn // ifExists is MariaDB-specific
+    | DROP COLUMN? ifExists? uid RESTRICT?                          #alterByDropColumn // ifExists is MariaDB-specific
     | DROP PRIMARY KEY                                              #alterByDropPrimaryKey
     | DROP indexFormat=(INDEX | KEY) ifExists? uid                  #alterByDropIndex
     | RENAME indexFormat=(INDEX | KEY) uid TO uid                   #alterByRenameIndex
diff --git a/debezium-ddl-parser/src/test/resources/mysql/examples/ddl_alter.sql b/debezium-ddl-parser/src/test/resources/mysql/examples/ddl_alter.sql
index 151b2c649..79f13f4b6 100644
--- a/debezium-ddl-parser/src/test/resources/mysql/examples/ddl_alter.sql
+++ b/debezium-ddl-parser/src/test/resources/mysql/examples/ddl_alter.sql
@@ -17,6 +17,16 @@ alter table table1 add primary key (id);
 alter table table1 add primary key table_pk (id);
 alter table table1 add primary key `table_pk` (id);
 alter table table1 add primary key `table_pk` (`id`);
+alter table add_test add column if not exists col1 varchar(255);
+alter table add_test add column if not exists col4 varchar(255);
+alter table add_test add index if not exists ix_add_test_col1 using btree (col1) comment 'test index';
+alter table add_test add index if not exists ix_add_test_col4 using btree (col4) comment 'test index';
+alter table add_test change column if exists col8 col9 tinyint;
+alter table add_test change column if exists col3 col5 tinyint;
+alter table add_test modify column if exists col9 tinyint;
+alter table add_test modify column if exists col5 varchar(255);
+alter table add_test drop column if exists col99;
+alter table add_test drop column if exists col5;
 #end
 #begin
 -- Alter database
diff --git a/debezium-ddl-parser/src/test/resources/mysql/examples/ddl_create.sql b/debezium-ddl-parser/src/test/resources/mysql/examples/ddl_create.sql
index ce7ae9b48..a1ec2c386 100644
--- a/debezium-ddl-parser/src/test/resources/mysql/examples/ddl_create.sql
+++ b/debezium-ddl-parser/src/test/resources/mysql/examples/ddl_create.sql
@@ -30,6 +30,7 @@ create table table_with_visible_index (id int, data varchar(50), UNIQUE INDEX `d
 create table table_with_index (id int, data varchar(50), UNIQUE INDEX `data_UNIQUE` (`data` ASC));
 create table transactional_table(name varchar(255), class_id int, id int) transactional=1;
 create table transactional(name varchar(255), class_id int, id int);
+create table add_test(col1 varchar(255), col2 int, col3 int);
 #end
 #begin
 -- Rename table
@@ -77,6 +78,7 @@ do begin update test.t2 set 1c = 1c + 1; end; -- //
 create index index1 on t1(col1) comment 'test index' comment 'some test' using btree;
 create unique index index2 using btree on t2(1c desc, `_` asc);
 create index index3 using hash on antlr_tokens(token(30) asc);
+create index ix_add_test_col1 on add_test(col1) comment 'test index' using btree;
 #end
 #begin
 -- Create logfile group