diff --git a/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java b/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
index 6596565829..0536f57af2 100644
--- a/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/ParserImpl.java
@@ -7179,11 +7179,10 @@ final class ParserImpl implements Parser {
                 try {
                     if (peekSelect(ctx, true)) {
                         SelectQueryImpl<Record> select = parseSelect(ctx);
-                        if (select.getSelect().size() != 1)
+                        if (Tools.degree(select) != 1)
                             throw ctx.exception("Select list must contain exactly one column");
 
-                        field = field((Select) select);
-                        return field;
+                        return field((Select) select);
                     }
                 }
                 catch (ParserException e) {
diff --git a/jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java b/jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java
index 29a508f2a1..2a9cc4576a 100644
--- a/jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/SelectQueryImpl.java
@@ -374,12 +374,7 @@ final class SelectQueryImpl<R extends Record> extends AbstractResultQuery<R> imp
     @SuppressWarnings("unchecked")
     @Override
     public final <T> Field<T> asField() {
-        List<Field<?>> s = getSelect();
-
-        if (s.size() != 1)
-            throw new IllegalStateException("Can only use single-column ResultProviderQuery as a field");
-
-        return new ScalarSubquery<>(this, (DataType<T>) s.get(0).getDataType());
+        return new ScalarSubquery<>(this, (DataType<T>) Tools.scalarType(this));
     }
 
     @Override
@@ -2707,6 +2702,14 @@ final class SelectQueryImpl<R extends Record> extends AbstractResultQuery<R> imp
 
 
 
+
+
+
+
+
+
+
+
 
 
 
diff --git a/jOOQ/src/main/java/org/jooq/impl/Tools.java b/jOOQ/src/main/java/org/jooq/impl/Tools.java
index 8a7961ab4d..63ff22e4ff 100644
--- a/jOOQ/src/main/java/org/jooq/impl/Tools.java
+++ b/jOOQ/src/main/java/org/jooq/impl/Tools.java
@@ -150,7 +150,10 @@ import static org.jooq.impl.Keywords.K_THROW;
 import static org.jooq.impl.Keywords.K_WHEN;
 import static org.jooq.impl.SQLDataType.BLOB;
 import static org.jooq.impl.SQLDataType.CLOB;
+import static org.jooq.impl.SQLDataType.JSON;
+import static org.jooq.impl.SQLDataType.JSONB;
 import static org.jooq.impl.SQLDataType.VARCHAR;
+import static org.jooq.impl.SQLDataType.XML;
 import static org.jooq.impl.Tools.DataCacheKey.DATA_REFLECTION_CACHE_GET_ANNOTATED_GETTER;
 import static org.jooq.impl.Tools.DataCacheKey.DATA_REFLECTION_CACHE_GET_ANNOTATED_MEMBERS;
 import static org.jooq.impl.Tools.DataCacheKey.DATA_REFLECTION_CACHE_GET_ANNOTATED_SETTERS;
@@ -3124,6 +3127,38 @@ final class Tools {
             return null;
     }
 
+    static final int degree(Select<?> select) {
+
+
+
+
+
+
+
+        return select.getSelect().size();
+    }
+
+    static final DataType<?> scalarType(Select<?> select) {
+
+
+
+
+
+
+
+
+
+
+
+
+        List<Field<?>> list = select.getSelect();
+
+        if (list.size() != 1)
+            throw new IllegalStateException("Only single-column selects have a scalar type");
+
+        return list.get(0).getDataType();
+    }
+
     /**
      * Add primary key conditions to a query
      */