diff --git a/docs/_plugins/conditonal_includes.rb b/docs/_plugins/conditonal_includes.rb
new file mode 100644
index 0000000000000..39280cbe5bec9
--- /dev/null
+++ b/docs/_plugins/conditonal_includes.rb
@@ -0,0 +1,55 @@
+module Jekyll
+  # Tag for including a file if it exists.
+  class IncludeRelativeIfExistsTag < Tags::IncludeRelativeTag
+    def render(context)
+      super
+    rescue IOError
+      "<!-- missing include: #{@file} -->"
+    end
+  end
+  
+  # Tag for including files generated as part of the various language APIs.
+  # If a SKIP_ flag is set, tolerate missing files. If not, raise an error.
+  class IncludeApiGenTag < Tags::IncludeRelativeTag
+    @@displayed_warning = false
+
+    def render(context)
+      super
+    rescue IOError => e
+      skip_flags = [
+        'SKIP_API',
+        'SKIP_SCALADOC',
+        'SKIP_PYTHONDOC',
+        'SKIP_RDOC',
+        'SKIP_SQLDOC',
+      ]
+      set_flags = skip_flags.select { |flag| ENV[flag] }
+      # A more sophisticated approach would be to accept a tag parameter
+      # specifying the relevant API so we tolerate missing files only for
+      # APIs that are explicitly skipped. But this is unnecessary for now.
+      # Instead, we simply tolerate missing files if _any_ skip flag is set.
+      if set_flags.any? then
+        set_flags_string = set_flags.join(', ')
+        if !@@displayed_warning then
+          STDERR.puts "Warning: Tolerating missing API files because the " \
+            "following skip flags are set: #{set_flags_string}"
+          @@displayed_warning = true
+        end
+        # "skip flags set: `#{set_flags_string}`; " \
+        "placeholder for missing API include: `#{@file}`"
+      else
+        raise e
+      end
+    end
+  end
+end
+
+Liquid::Template.register_tag(
+  'include_relative_if_exists',
+  Jekyll::IncludeRelativeIfExistsTag,
+)
+
+Liquid::Template.register_tag(
+  'include_api_gen',
+  Jekyll::IncludeApiGenTag,
+)
diff --git a/docs/sql-ref-functions-builtin.md b/docs/sql-ref-functions-builtin.md
index 0ff1432fabf8e..c5f4e44dec0d9 100644
--- a/docs/sql-ref-functions-builtin.md
+++ b/docs/sql-ref-functions-builtin.md
@@ -17,202 +17,102 @@ license: |
   limitations under the License.
 ---
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-agg-funcs-table.html' %}
 ### Aggregate Functions
-{% include_relative generated-agg-funcs-table.html %}
+{% include_api_gen generated-agg-funcs-table.html %}
 #### Examples
-{% include_relative generated-agg-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-agg-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-window-funcs-table.html' %}
 ### Window Functions
-{% include_relative generated-window-funcs-table.html %}
+{% include_api_gen generated-window-funcs-table.html %}
 #### Examples
-{% include_relative generated-window-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-window-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-array-funcs-table.html' %}
 ### Array Functions
-{% include_relative generated-array-funcs-table.html %}
+{% include_api_gen generated-array-funcs-table.html %}
 #### Examples
-{% include_relative generated-array-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-array-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-{% if static_file.name == 'generated-collection-funcs-table.html' %}
 ### Collection Functions
-{% include_relative generated-collection-funcs-table.html %}
+{% include_api_gen generated-collection-funcs-table.html %}
 #### Examples
-{% include_relative generated-collection-funcs-examples.html %}
-{% break %}
-{% endif %}
-{% endfor %}
+{% include_api_gen generated-collection-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-{% if static_file.name == 'generated-struct-funcs-table.html' %}
 ### STRUCT Functions
-{% include_relative generated-struct-funcs-table.html %}
+{% include_api_gen generated-struct-funcs-table.html %}
 #### Examples
-{% include_relative generated-struct-funcs-examples.html %}
-{% break %}
-{% endif %}
-{% endfor %}
+{% include_api_gen generated-struct-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-map-funcs-table.html' %}
 ### Map Functions
-{% include_relative generated-map-funcs-table.html %}
+{% include_api_gen generated-map-funcs-table.html %}
 #### Examples
-{% include_relative generated-map-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-map-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-datetime-funcs-table.html' %}
 ### Date and Timestamp Functions
-{% include_relative generated-datetime-funcs-table.html %}
+{% include_api_gen generated-datetime-funcs-table.html %}
 #### Examples
-{% include_relative generated-datetime-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-datetime-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-math-funcs-table.html' %}
 ### Mathematical Functions
-{% include_relative generated-math-funcs-table.html %}
+{% include_api_gen generated-math-funcs-table.html %}
 #### Examples
-{% include_relative generated-math-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-math-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-string-funcs-table.html' %}
 ### String Functions
-{% include_relative generated-string-funcs-table.html %}
+{% include_api_gen generated-string-funcs-table.html %}
 #### Examples
-{% include_relative generated-string-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-string-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-conditional-funcs-table.html' %}
 ### Conditional Functions
-{% include_relative generated-conditional-funcs-table.html %}
+{% include_api_gen generated-conditional-funcs-table.html %}
 #### Examples
-{% include_relative generated-conditional-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-conditional-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-{% if static_file.name == 'generated-hash-funcs-table.html' %}
 ### Hash Functions
-{% include_relative generated-hash-funcs-table.html %}
+{% include_api_gen generated-hash-funcs-table.html %}
 #### Examples
-{% include_relative generated-hash-funcs-examples.html %}
-{% break %}
-{% endif %}
-{% endfor %}
+{% include_api_gen generated-hash-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-{% if static_file.name == 'generated-csv-funcs-table.html' %}
 ### CSV Functions
-{% include_relative generated-csv-funcs-table.html %}
+{% include_api_gen generated-csv-funcs-table.html %}
 #### Examples
-{% include_relative generated-csv-funcs-examples.html %}
-{% break %}
-{% endif %}
-{% endfor %}
+{% include_api_gen generated-csv-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-{% if static_file.name == 'generated-json-funcs-table.html' %}
 ### JSON Functions
-{% include_relative generated-json-funcs-table.html %}
+{% include_api_gen generated-json-funcs-table.html %}
 #### Examples
-{% include_relative generated-json-funcs-examples.html %}
-{% break %}
-{% endif %}
-{% endfor %}
+{% include_api_gen generated-json-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-{% if static_file.name == 'generated-xml-funcs-table.html' %}
 ### XML Functions
-{% include_relative generated-xml-funcs-table.html %}
+{% include_api_gen generated-xml-funcs-table.html %}
 #### Examples
-{% include_relative generated-xml-funcs-examples.html %}
-{% break %}
-{% endif %}
-{% endfor %}
+{% include_api_gen generated-xml-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-{% if static_file.name == 'generated-url-funcs-table.html' %}
 ### URL Functions
-{% include_relative generated-url-funcs-table.html %}
+{% include_api_gen generated-url-funcs-table.html %}
 #### Examples
-{% include_relative generated-url-funcs-examples.html %}
-{% break %}
-{% endif %}
-{% endfor %}
+{% include_api_gen generated-url-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-bitwise-funcs-table.html' %}
 ### Bitwise Functions
-{% include_relative generated-bitwise-funcs-table.html %}
+{% include_api_gen generated-bitwise-funcs-table.html %}
 #### Examples
-{% include_relative generated-bitwise-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-bitwise-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-conversion-funcs-table.html' %}
 ### Conversion Functions
-{% include_relative generated-conversion-funcs-table.html %}
+{% include_api_gen generated-conversion-funcs-table.html %}
 #### Examples
-{% include_relative generated-conversion-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-conversion-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-predicate-funcs-table.html' %}
 ### Predicate Functions
-{% include_relative generated-predicate-funcs-table.html %}
+{% include_api_gen generated-predicate-funcs-table.html %}
 #### Examples
-{% include_relative generated-predicate-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-predicate-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-misc-funcs-table.html' %}
 ### Misc Functions
-{% include_relative generated-misc-funcs-table.html %}
+{% include_api_gen generated-misc-funcs-table.html %}
 #### Examples
-{% include_relative generated-misc-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-misc-funcs-examples.html %}
 
-{% for static_file in site.static_files %}
-    {% if static_file.name == 'generated-generator-funcs-table.html' %}
 ### Generator Functions
-{% include_relative generated-generator-funcs-table.html %}
+{% include_api_gen generated-generator-funcs-table.html %}
 #### Examples
-{% include_relative generated-generator-funcs-examples.html %}
-        {% break %}
-    {% endif %}
-{% endfor %}
+{% include_api_gen generated-generator-funcs-examples.html %}
diff --git a/docs/sql-ref-functions.md b/docs/sql-ref-functions.md
index cc9edd61f41ee..b4891fe72eb35 100644
--- a/docs/sql-ref-functions.md
+++ b/docs/sql-ref-functions.md
@@ -20,7 +20,7 @@ license: |
 ---
 
 Spark SQL provides two function features to meet a wide range of user needs: built-in functions and user-defined functions (UDFs).
-Built-in functions are commonly used routines that Spark SQL predefines and a complete list of the functions can be found in the [Built-in Functions](api/sql/) API document. UDFs allow users to define their own functions when the system’s built-in functions are not enough to perform the desired task.
+Built-in functions are commonly used routines that Spark SQL predefines and a complete list of the functions can be found in the [Built-in Functions](api/sql/index.html) API document. UDFs allow users to define their own functions when the system’s built-in functions are not enough to perform the desired task.
 
 ### Built-in Functions