Support HSQL and Postgrees using the same Liquibase config

liquibase-standard/src/main/java/liquibase/change/core/AddForeignKeyConstraintChange.java

@@ -278,12 +278,12 @@ public void setOnUpdate(ForeignKeyConstraintType rule) {
     public SqlStatement[] generateStatements(Database database) {
 
         boolean deferrable = false;
-        if (getDeferrable() != null) {
+        if (checkDeferrable(database) && getDeferrable() != null) {
             deferrable = getDeferrable();
         }
 
         boolean initiallyDeferred = false;
-        if (getInitiallyDeferred() != null) {
+        if (checkDeferrable(database) && getInitiallyDeferred() != null) {
             initiallyDeferred = getInitiallyDeferred();
         }
 
@@ -310,6 +310,10 @@ public SqlStatement[] generateStatements(Database database) {
         };
     }
 
+    private boolean checkDeferrable(Database database) {
+        return database.supportsInitiallyDeferrableColumns() || database.failOnDeferrable();
+    }
+
     @Override
     protected Change[] createInverses() {
         DropForeignKeyConstraintChange inverse = new DropForeignKeyConstraintChange();

liquibase-standard/src/main/java/liquibase/database/AbstractJdbcDatabase.java

@@ -168,6 +168,11 @@ public DatabaseObject[] getContainingObjects() {
         return null;
     }
 
+    @Override
+    public boolean failOnDeferrable() {
+        return true;
+    }
+
     // ------- DATABASE INFORMATION METHODS ---- //
 
     @Override

liquibase-standard/src/main/java/liquibase/database/Database.java

@@ -472,5 +472,8 @@ default String getDisplayName() {
     String unescapeDataTypeString(String dataTypeString);
 
     ValidationErrors validate();
+
+    boolean failOnDeferrable();
+
 }
 

liquibase-standard/src/main/java/liquibase/database/core/HsqlDatabase.java

@@ -519,4 +519,10 @@ public String getAutoIncrementClause(BigInteger startWith, BigInteger incrementB
         final String clause = super.getAutoIncrementClause(startWith, incrementBy, generationType, defaultOnNull);
         return clause.replace(",", ""); //sql doesn't use commas between the values
     }
+
+    @Override
+    public boolean failOnDeferrable() {
+        return false;
+    }
+
 }

liquibase-standard/src/main/java/liquibase/database/core/MockDatabase.java

@@ -796,6 +796,11 @@ public ValidationErrors validate() {
         return new ValidationErrors();
     }
 
+    @Override
+    public boolean failOnDeferrable() {
+        return true;
+    }
+
     @Override
     public boolean supportsNotNullConstraintNames() {
         return false;

liquibase-standard/src/main/java/liquibase/sqlgenerator/core/AddForeignKeyConstraintGenerator.java

@@ -24,8 +24,14 @@ public ValidationErrors validate(AddForeignKeyConstraintStatement addForeignKeyC
         ValidationErrors validationErrors = new ValidationErrors();
 
         if ((addForeignKeyConstraintStatement.isInitiallyDeferred() || addForeignKeyConstraintStatement.isDeferrable()) && !database.supportsInitiallyDeferrableColumns()) {
-            validationErrors.checkDisallowedField("initiallyDeferred", addForeignKeyConstraintStatement.isInitiallyDeferred(), database);
-            validationErrors.checkDisallowedField("deferrable", addForeignKeyConstraintStatement.isDeferrable(), database);
+            if (database.failOnDeferrable()) {
+                validationErrors.checkDisallowedField("initiallyDeferred", addForeignKeyConstraintStatement.isInitiallyDeferred(), database);
+                validationErrors.checkDisallowedField("deferrable", addForeignKeyConstraintStatement.isDeferrable(), database);
+            } else {
+                // reset this as it's not supported
+                addForeignKeyConstraintStatement.setDeferrable(false);
+                addForeignKeyConstraintStatement.setInitiallyDeferred(false);
+            }
         }
 
         validationErrors.checkRequiredField("baseColumnNames", addForeignKeyConstraintStatement.getBaseColumnNames());