From b1afee44cba746be519f9fe03c9eae3024ec77f3 Mon Sep 17 00:00:00 2001
From: Lukas Eder <lukas.eder@gmail.com>
Date: Tue, 30 Jun 2020 14:23:25 +0200
Subject: [PATCH] [jOOQ/jOOQ#10139] Unknown columns in code generator queries
 for Firebird 2.5

---
 .../jooq/meta/firebird/FirebirdDatabase.java  | 23 +++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/jOOQ-meta/src/main/java/org/jooq/meta/firebird/FirebirdDatabase.java b/jOOQ-meta/src/main/java/org/jooq/meta/firebird/FirebirdDatabase.java
index 5671723b9b..f29ea326c5 100644
--- a/jOOQ-meta/src/main/java/org/jooq/meta/firebird/FirebirdDatabase.java
+++ b/jOOQ-meta/src/main/java/org/jooq/meta/firebird/FirebirdDatabase.java
@@ -110,6 +110,8 @@ import org.jooq.util.firebird.FirebirdDataType;
  */
 public class FirebirdDatabase extends AbstractDatabase {
 
+    private static Boolean is30;
+
     public FirebirdDatabase() {
 
         // Firebird doesn't know schemata
@@ -351,12 +353,16 @@ public class FirebirdDatabase extends AbstractDatabase {
         for (Record record : create()
                 .select(
                     trim(RDB$GENERATORS.RDB$GENERATOR_NAME).as(RDB$GENERATORS.RDB$GENERATOR_NAME),
-                    nullif(RDB$GENERATORS.RDB$INITIAL_VALUE, zero()).as(RDB$GENERATORS.RDB$INITIAL_VALUE),
-                    nullif(RDB$GENERATORS.RDB$GENERATOR_INCREMENT, one()).as(RDB$GENERATORS.RDB$GENERATOR_INCREMENT)
+                    (is30()
+                        ? nullif(RDB$GENERATORS.RDB$INITIAL_VALUE, zero())
+                        : zero())
+                    .as(RDB$GENERATORS.RDB$INITIAL_VALUE),
+                    (is30()
+                        ? nullif(RDB$GENERATORS.RDB$GENERATOR_INCREMENT, one())
+                        : one()).as(RDB$GENERATORS.RDB$GENERATOR_INCREMENT)
                 )
                 .from(RDB$GENERATORS)
-                .orderBy(1)
-                .fetch()) {
+                .orderBy(1)) {
 
             SchemaDefinition schema = getSchemata().get(0);
             DataTypeDefinition type = new DefaultDataTypeDefinition(
@@ -520,4 +526,13 @@ public class FirebirdDatabase extends AbstractDatabase {
                 .when((short) 261, (short) 0)
                 .otherwise(f.RDB$CHARACTER_LENGTH);
     }
+
+    boolean is30() {
+
+        // [#4254] RDB$GENERATORS.RDB$INITIAL_VALUE was added in Firebird 3.0 only
+        if (is30 == null)
+            is30 = exists(RDB$GENERATORS.RDB$INITIAL_VALUE);
+
+        return is30;
+    }
 }