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支持前缀索引

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Offering: GaussDB Kernel

More detail:
1、支持前缀索引创建
2、支持前缀索引匹配
This commit is contained in:
li-judong
2022-04-09 11:38:05 +08:00
parent 5e987cdd3a
commit 056317bad3
28 changed files with 4564 additions and 49 deletions
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63
src/common/backend/parser/parse_expr.cpp
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@ -89,9 +89,10 @@ static Node* transformConnectByRootFuncCall(ParseState* pstate, Node* funcNameVa
static char *ColumnRefFindRelname(ParseState *pstate, const char *colname);
static Node *transformStartWithColumnRef(ParseState *pstate, ColumnRef *cref, char **colname);
static Node* tryTransformFunc(ParseState* pstate, List* fields, int location);
static Node* transformPrefixKey(ParseState* pstate, PrefixKey* pkey);
#define OrientedIsCOLorPAX(rte) ((rte)->orientation == REL_COL_ORIENTED || (rte)->orientation == REL_PAX_ORIENTED)
#define INDEX_KEY_MAX_PREFIX_LENGTH (int)2676
/*
* transformExpr -
* Analyze and transform expressions. Type checking and type casting is
@ -311,6 +312,9 @@ Node* transformExpr(ParseState* pstate, Node* expr)
case T_PredictByFunction:
result = transformPredictByFunction(pstate, (PredictByFunction*) expr);
break;
case T_PrefixKey:
result = transformPrefixKey(pstate, (PrefixKey*)expr);
break;
/*********************************************
* Quietly accept node types that may be presented when we are
@ -3105,3 +3109,60 @@ static char *ColumnRefFindRelname(ParseState *pstate, const char *colname)
return relname;
}
/*
* Transform a PrefixKey.
*/
static Node* transformPrefixKey(ParseState* pstate, PrefixKey* pkey)
{
Node *argnode = (Node*)pkey->arg;
int maxlen;
int location = ((ColumnRef*)argnode)->location;
Assert(nodeTag(argnode) == T_ColumnRef);
if (pkey->length <= 0 || pkey->length > INDEX_KEY_MAX_PREFIX_LENGTH) {
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("index key prefix length(%d) must be positive and cannot exceed %d",
pkey->length, INDEX_KEY_MAX_PREFIX_LENGTH),
parser_errposition(pstate, location)));
}
argnode = transformExpr(pstate, argnode);
Assert(nodeTag(argnode) == T_Var);
switch (((Var*)argnode)->vartype) {
case TEXTOID:
case CLOBOID:
case BPCHAROID:
case VARCHAROID:
case NVARCHAR2OID:
case BLOBOID:
case RAWOID:
case BYTEAOID:
pkey->arg = (Expr*)argnode;
break;
default:
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("index prefix key are not supported by column type %s",
format_type_be(((Var*)argnode)->vartype)),
parser_errposition(pstate, location)));
}
maxlen = ((Var*)argnode)->vartypmod;
if (maxlen > 0) {
maxlen -= VARHDRSZ;
if (pkey->length > maxlen) {
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("index key prefix length(%d) too long for type %s(%d)",
pkey->length, format_type_be(((Var*)argnode)->vartype), maxlen),
parser_errposition(pstate, location)));
}
}
return (Node*)pkey;
}