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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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44
src/gausskernel/runtime/executor/execQual.cpp
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@ -5148,6 +5148,37 @@ static Datum ExecEvalCurrentOfExpr(ExprState* exprstate, ExprContext* econtext,
return 0; /* keep compiler quiet */
}
/* ----------------------------------------------------------------
* ExecEvalPrefixText
* ----------------------------------------------------------------
*/
static Datum ExecEvalPrefixText(GenericExprState* state, ExprContext* econtext, bool* isNull, ExprDoneCond* isDone)
{
PrefixKey* pkey = (PrefixKey*)state->xprstate.expr;
Datum result = ExecEvalExpr(state->arg, econtext, isNull, isDone);
if (*isNull) {
return (Datum)0;
}
return PointerGetDatum(text_substring(result, 1, pkey->length, false));
}
/* ----------------------------------------------------------------
* ExecEvalPrefixBytea
* ----------------------------------------------------------------
*/
static Datum ExecEvalPrefixBytea(GenericExprState* state, ExprContext* econtext, bool* isNull, ExprDoneCond* isDone)
{
PrefixKey* pkey = (PrefixKey*)state->xprstate.expr;
Datum result = ExecEvalExpr(state->arg, econtext, isNull, isDone);
if (*isNull) {
return (Datum)0;
}
return PointerGetDatum(bytea_substring(result, 1, pkey->length, false));
}
/*
* ExecEvalExprSwitchContext
*
@ -5859,6 +5890,19 @@ ExprState* ExecInitExpr(Expr* node, PlanState* parent)
state = (ExprState*)rnstate;
state->evalfunc = (ExprStateEvalFunc)ExecEvalRownum;
} break;
case T_PrefixKey: {
PrefixKey* pkey = (PrefixKey*)node;
GenericExprState* gstate = makeNode(GenericExprState);
Oid argtype = exprType((Node*)pkey->arg);
if (argtype == BYTEAOID || argtype == RAWOID || argtype == BLOBOID) {
gstate->xprstate.evalfunc = (ExprStateEvalFunc)ExecEvalPrefixBytea;
} else {
gstate->xprstate.evalfunc = (ExprStateEvalFunc)ExecEvalPrefixText;
}
gstate->arg = ExecInitExpr(pkey->arg, parent);
state = (ExprState*)gstate;
} break;
default:
ereport(ERROR,
(errcode(ERRCODE_UNRECOGNIZED_NODE_TYPE),