Datum
charge(PG_FUNCTION_ARGS)
{
char arg1 = PG_GETARG_CHAR(0);
char arg2 = PG_GETARG_CHAR(1);
PG_RETURN_BOOL((uint8) arg1 >= (uint8) arg2);
}
Datum
chareq(PG_FUNCTION_ARGS)
{
char arg1 = PG_GETARG_CHAR(0);
char arg2 = PG_GETARG_CHAR(1);
PG_RETURN_BOOL(arg1 == arg2);
}
Datum
charmul(PG_FUNCTION_ARGS)
{
char arg1 = PG_GETARG_CHAR(0);
char arg2 = PG_GETARG_CHAR(1);
PG_RETURN_CHAR((int8) arg1 * (int8) arg2);
}
Datum
bmcharcmp(PG_FUNCTION_ARGS)
{
char a = PG_GETARG_CHAR(0);
char b = PG_GETARG_CHAR(1);
/* Be careful to compare chars as unsigned */
PG_RETURN_INT32((int32) ((uint8) a) - (int32) ((uint8) b));
}
Datum
chardiv(PG_FUNCTION_ARGS)
{
char arg1 = PG_GETARG_CHAR(0);
char arg2 = PG_GETARG_CHAR(1);
if (arg2 == 0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero")));
PG_RETURN_CHAR((int8) arg1 / (int8) arg2);
}
Datum
chartoi4(PG_FUNCTION_ARGS)
{
char arg1 = PG_GETARG_CHAR(0);
PG_RETURN_INT32((int32) ((int8) arg1));
}
Datum
tsvector_setweight(PG_FUNCTION_ARGS)
{
TSVector in = PG_GETARG_TSVECTOR(0);
char cw = PG_GETARG_CHAR(1);
TSVector out;
int i,
j;
WordEntry *entry;
WordEntryPos *p;
int w = 0;
switch (cw)
{
case 'A':
case 'a':
w = 3;
break;
case 'B':
case 'b':
w = 2;
break;
case 'C':
case 'c':
w = 1;
break;
case 'D':
case 'd':
w = 0;
break;
default:
/* internal error */
elog(ERROR, "unrecognized weight: %d", cw);
}
out = (TSVector) palloc(VARSIZE(in));
memcpy(out, in, VARSIZE(in));
entry = ARRPTR(out);
i = out->size;
while (i--)
{
if ((j = POSDATALEN(out, entry)) != 0)
{
p = POSDATAPTR(out, entry);
while (j--)
{
WEP_SETWEIGHT(*p, w);
p++;
}
}
entry++;
}
PG_FREE_IF_COPY(in, 0);
PG_RETURN_POINTER(out);
}
/*
* charsend - converts char to binary format
*/
Datum
charsend(PG_FUNCTION_ARGS)
{
char arg1 = PG_GETARG_CHAR(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendbyte(&buf, arg1);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* charout - converts 'x' to "x"
*
* Note that if the char value is \0, the resulting string will appear
* to be empty (null-terminated after zero characters). So this is the
* inverse of the charin() function for such data.
*/
Datum
charout(PG_FUNCTION_ARGS)
{
char ch = PG_GETARG_CHAR(0);
char *result = (char *) palloc(2);
result[0] = ch;
result[1] = '\0';
PG_RETURN_CSTRING(result);
}
Datum
caql_copy_to_in_memory_pg_class(PG_FUNCTION_ARGS)
{
text *inText = PG_GETARG_TEXT_P(0);;
char *inStr = text_to_cstring(inText);
char kind = PG_GETARG_CHAR(1);
StringInfoData buf;
initStringInfo(&buf);
/* create tuples for pg_class table */
HeapTuple reltup = NULL;
HeapTuple copytup = NULL;
Form_pg_class relform;
cqContext *pcqCtx;
cqContext *pcqCtxInsert;
pcqCtx = caql_beginscan(
NULL,
cql("SELECT * FROM pg_class "
" WHERE relname = :1",
CStringGetDatum((char *) inStr)));
reltup = caql_getnext(pcqCtx);
if (NULL == reltup)
{
appendStringInfo(&buf, "no tuples with relname=%s found!", inStr);
}
else
{
copytup = heaptuple_copy_to(reltup, NULL, NULL);
relform = (Form_pg_class) GETSTRUCT(copytup);
relform->relkind = kind;
appendStringInfo(&buf, "table pg_class, insert 1 line (relname %s, relkind %c)", NameStr(relform->relname), kind);
/* insert */
pcqCtxInsert = caql_beginscan(
NULL,
cql("INSERT INTO pg_class", NULL));
caql_insert_inmem(pcqCtxInsert, copytup);
caql_endscan(pcqCtxInsert);
heap_freetuple(copytup);
}
caql_endscan(pcqCtx);
PG_RETURN_TEXT_P(cstring_to_text(buf.data));
}
/* char_bpchar()
* Convert char to bpchar(1).
*/
Datum
char_bpchar(PG_FUNCTION_ARGS)
{
char c = PG_GETARG_CHAR(0);
BpChar *result;
result = (BpChar *) palloc(VARHDRSZ + 1);
VARATT_SIZEP(result) = VARHDRSZ + 1;
*(VARDATA(result)) = c;
PG_RETURN_BPCHAR_P(result);
}
Datum
char_text(PG_FUNCTION_ARGS)
{
char arg1 = PG_GETARG_CHAR(0);
text *result = palloc(VARHDRSZ + 1);
/*
* Convert \0 to an empty string, for consistency with charout (and
* because the text stuff doesn't like embedded nulls all that well).
*/
if (arg1 != '\0')
{
SET_VARSIZE(result, VARHDRSZ + 1);
*(VARDATA(result)) = arg1;
}
else
SET_VARSIZE(result, VARHDRSZ);
PG_RETURN_TEXT_P(result);
}
/*
* master_create_distributed_table inserts the table and partition column
* information into the partition metadata table. Note that this function
* currently assumes the table is hash partitioned.
*/
Datum
master_create_distributed_table(PG_FUNCTION_ARGS)
{
text *tableNameText = PG_GETARG_TEXT_P(0);
text *partitionColumnText = PG_GETARG_TEXT_P(1);
char partitionMethod = PG_GETARG_CHAR(2);
Oid distributedTableId = ResolveRelationId(tableNameText);
char relationKind = '\0';
char *partitionColumnName = text_to_cstring(partitionColumnText);
char *tableName = text_to_cstring(tableNameText);
Var *partitionColumn = NULL;
/* verify target relation is either regular or foreign table */
relationKind = get_rel_relkind(distributedTableId);
if (relationKind != RELKIND_RELATION && relationKind != RELKIND_FOREIGN_TABLE)
{
ereport(ERROR, (errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot distribute relation: %s", tableName),
errdetail("Distributed relations must be regular or "
"foreign tables.")));
}
/* this will error out if no column exists with the specified name */
partitionColumn = ColumnNameToColumn(distributedTableId, partitionColumnName);
/* check for support function needed by specified partition method */
if (partitionMethod == HASH_PARTITION_TYPE)
{
Oid hashSupportFunction = SupportFunctionForColumn(partitionColumn, HASH_AM_OID,
HASHPROC);
if (hashSupportFunction == InvalidOid)
{
ereport(ERROR, (errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("could not identify a hash function for type %s",
format_type_be(partitionColumn->vartype)),
errdatatype(partitionColumn->vartype),
errdetail("Partition column types must have a hash function "
"defined to use hash partitioning.")));
}
}
else if (partitionMethod == RANGE_PARTITION_TYPE)
{
Oid btreeSupportFunction = InvalidOid;
/*
* Error out immediately since we don't yet support range partitioning,
* but the checks below are ready for when we do.
*
* TODO: Remove when range partitioning is supported.
*/
ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("pg_shard only supports hash partitioning")));
btreeSupportFunction = SupportFunctionForColumn(partitionColumn, BTREE_AM_OID,
BTORDER_PROC);
if (btreeSupportFunction == InvalidOid)
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("could not identify a comparison function for type %s",
format_type_be(partitionColumn->vartype)),
errdatatype(partitionColumn->vartype),
errdetail("Partition column types must have a comparison function "
"defined to use range partitioning.")));
}
}
/* insert row into the partition metadata table */
InsertPartitionRow(distributedTableId, partitionMethod, partitionColumnText);
PG_RETURN_VOID();
}
/* Note: this is used for both "char" and boolean datatypes */
Datum
hashchar(PG_FUNCTION_ARGS)
{
PG_RETURN_UINT32(~((uint32) PG_GETARG_CHAR(0)));
}
