Pull Request已成功合入, 合并人@opengauss_bot
（感谢 xiahanzhi 的贡献）
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这里的 ScanKeyEntryInitialize 可能不应只放在else分支。
当索引键为 int8、查询键为 int4 时，if分支仅设置cmp_proc = F_BTINT84CMP，随后绕过本行，导致inskey->scankeys[i] 未初始化。后续 B-tree 比较使用sk_attno 调用 index_getattr()，会触发断言失败。附本地复现用例：
CREATE TABLE smp_int84_min (k int8 NOT NULL);
INSERT INTO smp_int84_min VALUES (1);
CREATE INDEX smp_int84_min_k_idx ON smp_int84_min(k);
ANALYZE smp_int84_min;
SET query_dop = 3;
SET enable_force_smp = on;
SET enable_seqscan = off;
SET enable_indexscan = on;
SET enable_indexonlyscan = off;
SET enable_bitmapscan = off;
EXPLAIN (COSTS OFF)
SELECT count(*) FROM smp_int84_min WHERE k >= 1;
SELECT count(*) FROM smp_int84_min WHERE k >= 1;
【标题】(请简要描述下实现的内容)
实现索引扫描SMP
【实现内容】:
实现索引扫描SMP
【根因分析】:
【实现方案】:
二阶段扫描，第一阶段划分范围，第二阶段按划分范围扫描
【关联需求或issue】:
【开发自验报告】:
索引SMP资料
不涉及
不涉及
不涉及
不涉及
不涉及
不涉及
【其他说明】:
覆盖率