mirror of https://github.com/citusdata/citus.git
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* master_split_shards.c
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*
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* This file contains functions to split a shard according to a given
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* distribution column value.
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*
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* Copyright (c) Citus Data, Inc.
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "c.h"
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#include "fmgr.h"
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#include "catalog/pg_class.h"
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#include "distributed/colocation_utils.h"
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#include "distributed/master_protocol.h"
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#include "distributed/metadata_cache.h"
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#include "distributed/metadata_sync.h"
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#include "distributed/multi_join_order.h"
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#include "distributed/multi_router_planner.h"
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#include "distributed/pg_dist_partition.h"
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#include "distributed/pg_dist_shard.h"
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#include "distributed/remote_commands.h"
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#include "distributed/resource_lock.h"
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#include "distributed/worker_manager.h"
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#include "distributed/worker_protocol.h"
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#include "distributed/worker_transaction.h"
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#include "nodes/pg_list.h"
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#include "storage/lock.h"
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#include "utils/builtins.h"
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#include "utils/elog.h"
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#include "utils/errcodes.h"
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#include "utils/lsyscache.h"
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#include "utils/typcache.h"
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/* declarations for dynamic loading */
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PG_FUNCTION_INFO_V1(isolate_tenant_to_new_shard);
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PG_FUNCTION_INFO_V1(worker_hash);
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/*
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* isolate_tenant_to_new_shard isolates a tenant to its own shard by spliting
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* the current matching shard.
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*/
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Datum
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isolate_tenant_to_new_shard(PG_FUNCTION_ARGS)
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{
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ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("isolate_tenant_to_new_shard() is only supported on "
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"Citus Enterprise")));
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}
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/*
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* worker_hash returns the hashed value of the given value.
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*/
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Datum
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worker_hash(PG_FUNCTION_ARGS)
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{
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Datum valueDatum = PG_GETARG_DATUM(0);
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CheckCitusVersion(ERROR);
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/* figure out hash function from the data type */
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Oid valueDataType = get_fn_expr_argtype(fcinfo->flinfo, 0);
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TypeCacheEntry *typeEntry = lookup_type_cache(valueDataType,
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TYPECACHE_HASH_PROC_FINFO);
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if (typeEntry->hash_proc_finfo.fn_oid == InvalidOid)
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{
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ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot find a hash function for the input type"),
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errhint("Cast input to a data type with a hash function.")));
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}
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FmgrInfo *hashFunction = palloc0(sizeof(FmgrInfo));
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fmgr_info_copy(hashFunction, &(typeEntry->hash_proc_finfo), CurrentMemoryContext);
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/* calculate hash value */
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Datum hashedValueDatum =
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FunctionCall1Coll(hashFunction, PG_GET_COLLATION(), valueDatum);
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PG_RETURN_INT32(hashedValueDatum);
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}
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