From 9b180d7b14d307462222a7399de8530a220fd0bf Mon Sep 17 00:00:00 2001
From: lukaseder <lukas.eder@gmail.com>
Date: Mon, 31 Jul 2017 15:29:22 +0200
Subject: [PATCH] [#5955] Added support for parsing ALTER COLUMN

---
 .../resources/org/jooq/web/grammar-3.10.txt   |  1 +
 .../main/java/org/jooq/impl/ParserImpl.java   | 28 +++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/jOOQ-manual/src/main/resources/org/jooq/web/grammar-3.10.txt b/jOOQ-manual/src/main/resources/org/jooq/web/grammar-3.10.txt
index 5681650c26..4077c9fe48 100644
--- a/jOOQ-manual/src/main/resources/org/jooq/web/grammar-3.10.txt
+++ b/jOOQ-manual/src/main/resources/org/jooq/web/grammar-3.10.txt
@@ -44,6 +44,7 @@ alterTableStatement = 'ALTER TABLE' [ 'IF EXISTS' ] tableName break
     | 'DEFAULT' concat
     )
   }
+| ( 'ALTER' | 'MODIFY' ) [ 'COLUMN' ] identifier dataType [ [ 'NOT' ] 'NULL' ]
 | 'DROP COLUMN' identifier [ 'CASCADE' | 'RESTRICT' ]
 | 'DROP CONSTRAINT' constraintName
 | 'RENAME' [ ( 'COLUMN' | 'INDEX' | 'CONSTRAINT' ) identifier ] 'TO' identifier
diff --git a/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java b/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
index 3a3c52ed9f..2493ba9221 100644
--- a/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
@@ -1677,6 +1677,10 @@ class ParserImpl implements Parser {
                         return s1.add(field(fieldName, type), type);
                     }
                 }
+                else if (parseKeywordIf(ctx, "ALTER")) {
+                    parseKeywordIf(ctx, "COLUMN");
+                    return parseAlterTableAlterColumn(ctx, s1);
+                }
 
                 break;
 
@@ -1706,6 +1710,14 @@ class ParserImpl implements Parser {
 
                 break;
 
+            case 'm':
+            case 'M':
+                if (parseKeywordIf(ctx, "MODIFY")) {
+                    parseKeywordIf(ctx, "COLUMN");
+                    return parseAlterTableAlterColumn(ctx, s1);
+                }
+                break;
+
             case 'r':
             case 'R':
                 if (parseKeywordIf(ctx, "RENAME")) {
@@ -1743,6 +1755,22 @@ class ParserImpl implements Parser {
         throw ctx.unexpectedToken();
     }
 
+    private static final DDLQuery parseAlterTableAlterColumn(ParserContext ctx, AlterTableStep s1) {
+        TableField<?, ?> field = parseFieldName(ctx);
+
+        if (parseKeywordIf(ctx, "TYPE") || parseKeywordIf(ctx, "SET DATA TYPE"))
+            ;
+
+        DataType<?> type = parseDataType(ctx);
+
+        if (parseKeywordIf(ctx, "NULL"))
+            type = type.nullable(true);
+        else if (parseKeywordIf(ctx, "NOT NULL"))
+            type = type.nullable(false);
+
+        return s1.alter(field).set(type);
+    }
+
     private static final DDLQuery parseRename(ParserContext ctx) {
         parseKeyword(ctx, "RENAME");
         parseWhitespaceIf(ctx);