From fd32a9f0bca3aeaabed6f79c0a3e0ede28dfcca2 Mon Sep 17 00:00:00 2001
From: Lukas Eder <lukas.eder@gmail.com>
Date: Thu, 9 Feb 2023 10:17:41 +0100
Subject: [PATCH] [jOOQ/jOOQ#14598] Exception while executing meta query on
 MySQL 5.6: Unknown column 'information_schema.COLUMNS.GENERATION_EXPRESSION'

---
 .../org/jooq/meta/mysql/MySQLDatabase.java    | 32 ++++++++++++-------
 .../jooq/meta/mysql/MySQLTableDefinition.java |  6 +---
 2 files changed, 21 insertions(+), 17 deletions(-)

diff --git a/jOOQ-meta/src/main/java/org/jooq/meta/mysql/MySQLDatabase.java b/jOOQ-meta/src/main/java/org/jooq/meta/mysql/MySQLDatabase.java
index 00332043fa..d79e871296 100644
--- a/jOOQ-meta/src/main/java/org/jooq/meta/mysql/MySQLDatabase.java
+++ b/jOOQ-meta/src/main/java/org/jooq/meta/mysql/MySQLDatabase.java
@@ -45,12 +45,14 @@ import static org.jooq.Records.mapping;
 import static org.jooq.SQLDialect.MARIADB;
 import static org.jooq.SQLDialect.MYSQL;
 // ...
+// ...
 import static org.jooq.impl.DSL.inline;
 import static org.jooq.impl.DSL.noCondition;
 import static org.jooq.impl.DSL.row;
 import static org.jooq.impl.DSL.select;
 import static org.jooq.impl.DSL.when;
 import static org.jooq.impl.SQLDataType.INTEGER;
+import static org.jooq.impl.SQLDataType.VARCHAR;
 import static org.jooq.meta.mysql.information_schema.Tables.CHECK_CONSTRAINTS;
 import static org.jooq.meta.mysql.information_schema.Tables.COLUMNS;
 import static org.jooq.meta.mysql.information_schema.Tables.KEY_COLUMN_USAGE;
@@ -76,9 +78,7 @@ import org.jooq.Field;
 // ...
 import org.jooq.Record;
 import org.jooq.Record12;
-import org.jooq.Record5;
 import org.jooq.Record6;
-import org.jooq.Records;
 import org.jooq.Result;
 import org.jooq.ResultQuery;
 import org.jooq.SQLDialect;
@@ -87,6 +87,7 @@ import org.jooq.Table;
 import org.jooq.TableField;
 import org.jooq.TableOptions.TableType;
 import org.jooq.impl.DSL;
+import org.jooq.impl.SQLDataType;
 import org.jooq.meta.AbstractDatabase;
 import org.jooq.meta.AbstractIndexDefinition;
 import org.jooq.meta.ArrayDefinition;
@@ -117,6 +118,7 @@ import org.jooq.tools.csv.CSVReader;
  */
 public class MySQLDatabase extends AbstractDatabase implements ResultQueryDatabase {
 
+    private Boolean is5_7;
     private Boolean is8;
     private Boolean is8_0_16;
 
@@ -262,6 +264,16 @@ public class MySQLDatabase extends AbstractDatabase implements ResultQueryDataba
         return is8_0_16;
     }
 
+    protected boolean is5_7() {
+
+        // [#14598] The information_schema.columns.GENERATION_EXPRESSION column was added in MySQL 5.7 only
+        if (is5_7 == null)
+            is5_7 = configuredDialectIsNotFamilyAndSupports(asList(MYSQL), () -> exists(COLUMNS.GENERATION_EXPRESSION))
+                 || configuredDialectIsNotFamilyAndSupports(asList(MARIADB), () -> exists(COLUMNS.GENERATION_EXPRESSION));
+
+        return is5_7;
+    }
+
     @Override
     public ResultQuery<Record6<String, String, String, String, String, Integer>> primaryKeys(List<String> schemas) {
         return keys(schemas, true);
@@ -633,14 +645,10 @@ public class MySQLDatabase extends AbstractDatabase implements ResultQueryDataba
         return schemas;
     }
 
-
-
-
-
-
-
-
-
-
-
+    protected Field<String> generationExpression(Field<String> generationExpression) {
+        if (is5_7())
+            return generationExpression;
+        else
+            return inline(null, VARCHAR);
+    }
 }
diff --git a/jOOQ-meta/src/main/java/org/jooq/meta/mysql/MySQLTableDefinition.java b/jOOQ-meta/src/main/java/org/jooq/meta/mysql/MySQLTableDefinition.java
index e3120ff482..393999e55d 100644
--- a/jOOQ-meta/src/main/java/org/jooq/meta/mysql/MySQLTableDefinition.java
+++ b/jOOQ-meta/src/main/java/org/jooq/meta/mysql/MySQLTableDefinition.java
@@ -82,11 +82,7 @@ public class MySQLTableDefinition extends AbstractTableDefinition {
     public List<ColumnDefinition> getElements0() throws SQLException {
         List<ColumnDefinition> result = new ArrayList<>();
         MySQLDatabase database = (MySQLDatabase) getDatabase();
-        Field<String> generationExpression = COLUMNS.GENERATION_EXPRESSION;
-
-
-
-
+        Field<String> generationExpression = database.generationExpression(COLUMNS.GENERATION_EXPRESSION);
 
         for (Record record : create().select(
                     COLUMNS.ORDINAL_POSITION,