Function generatePartitions

src/backend/parser/parse_partition_gp.c:1480–1744

* Create a list of CreateStmts, to create partitions based on 'gpPartDef' * specification. */

 * specification.
 */
List *
generatePartitions(Oid parentrelid, GpPartitionDefinition *gpPartSpec,
				   PartitionSpec *subPartSpec, const char *queryString,
				   List *parentoptions, const char *parentaccessmethod,
				   List *parentattenc, CreateStmtOrigin origin)
{
	Relation	parentrel;
	List	   *result = NIL;
	ParseState *pstate;
	ListCell	*lc;
	List	   *ancestors = get_partition_ancestors(parentrelid);
	partname_comp partcomp = {.tablename=NULL, .level=0, .partnum=0};
	bool isSubTemplate = false;
	List       *penc_cls_before_merge = NIL;
	List       *penc_cls = NIL;
	List       *parent_tblenc = NIL;
	bool		hasImplicitRangeBounds;

	partcomp.level = list_length(ancestors) + 1;
	if (0 < gp_max_partition_level && partcomp.level > gp_max_partition_level)
	{
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
				 errmsg("Exceeds maximum configured partitioning level of %d", gp_max_partition_level)));
	}

	pstate = make_parsestate(NULL);
	pstate->p_sourcetext = queryString;

	parentrel = table_open(parentrelid, NoLock);

	/* Remove "tablename" cell from parentOptions, if exists */
	extract_tablename_from_options(&parentoptions);

	if (subPartSpec && subPartSpec->gpPartDef)
	{
		Assert(subPartSpec->gpPartDef->isTemplate);
		isSubTemplate = subPartSpec->gpPartDef->isTemplate;
		/*
		 * If the subpartition specification is read from gp_partition_template
		 * catalog, we don't need to call StoreGpPartitionTemplate. This will
		 * help to save some IO since StoreGpPartitionTemplate trying to scan
		 * gp_partition_template.
		 */
		if (isSubTemplate && !subPartSpec->gpPartDef->fromCatalog)
			StoreGpPartitionTemplate(ancestors ? llast_oid(ancestors) : parentrelid,
									 partcomp.level, subPartSpec->gpPartDef);
	}

	foreach(lc, parentattenc)
	{
		Node       *n = lfirst(lc);
		if (IsA(n, ColumnReferenceStorageDirective))
			parent_tblenc = lappend(parent_tblenc, lfirst(lc));
	}

	foreach(lc, gpPartSpec->partDefElems)
	{