From f95bc28ebab47b86bdb7101ff6d8e4ccfb014ed3 Mon Sep 17 00:00:00 2001
From: Lukas Eder <lukas.eder@gmail.com>
Date: Wed, 3 Jun 2020 16:56:05 +0200
Subject: [PATCH] [jOOQ/jOOQ#681] Fix ALTER DOMAIN .. DROP CONSTRAINT IF EXISTS
 for PG

---
 jOOQ/src/main/java/org/jooq/impl/AlterDomainImpl.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/jOOQ/src/main/java/org/jooq/impl/AlterDomainImpl.java b/jOOQ/src/main/java/org/jooq/impl/AlterDomainImpl.java
index e9f0a7f309..f54d7cfc02 100644
--- a/jOOQ/src/main/java/org/jooq/impl/AlterDomainImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/AlterDomainImpl.java
@@ -309,7 +309,7 @@ implements
 
 
     private static final Set<SQLDialect> NO_SUPPORT_RENAME_CONSTRAINT_IF_EXISTS = SQLDialect.supportedBy(FIREBIRD, POSTGRES);
-    private static final Set<SQLDialect> NO_SUPPORT_DROP_CONSTRAINT_IF_EXISTS   = SQLDialect.supportedBy(FIREBIRD, POSTGRES);
+    private static final Set<SQLDialect> NO_SUPPORT_DROP_CONSTRAINT_IF_EXISTS   = SQLDialect.supportedBy(FIREBIRD);
 
     private final boolean supportsRenameConstraintIfExists(Context<?> ctx) {
         return !NO_SUPPORT_RENAME_CONSTRAINT_IF_EXISTS.contains(ctx.family());
@@ -321,7 +321,8 @@ implements
 
     @Override
     public final void accept(Context<?> ctx) {
-        if (renameConstraintIfExists && !supportsRenameConstraintIfExists(ctx)) {
+        if (renameConstraintIfExists && !supportsRenameConstraintIfExists(ctx) ||
+            dropConstraintIfExists && !supportsDropConstraintIfExists(ctx)) {
             Tools.beginTryCatch(ctx, DDLStatementType.ALTER_DOMAIN);
             accept0(ctx);
             Tools.endTryCatch(ctx, DDLStatementType.ALTER_DOMAIN);