read_sql_construct6内存泄漏问题

【标题描述】:
【测试类型：SQL功能/存储功能/接口功能/工具功能/性能/并发/压力长稳/故障注入/安全/资料/编码规范】【测试版本：x.x.x】 问题描述

【操作系统和硬件信息】(查询命令: cat /etc/system-release, uname -a):

【测试环境】(单机/1主x备x级联备):

【被测功能】:

【测试类型】:

【数据库版本】(查询命令: gaussdb -V):
commit-id: 9781cc5b9387db9844db8919576d6eedda87eabd

【预置条件】:

【操作步骤】(请填写详细的操作步骤):
编译memcheck版本，跑fastcheck用例

【预期输出】:

【实际输出】:
```
==2153656==ERROR: AddressSanitizer: stack-buffer-overflow on address 0xfffcff39518c at pc 0x0000050762d8 bp 0xfffcff394ac0 sp 0xfffcff394ad8
READ of size 4 at 0xfffcff39518c thread T9 (TPLworker)
    #0 0x50762d4 in read_sql_construct6 /data/chenxiaobin/openGauss-server/src/common/pl/plpgsql/src/gram.y:9950
    #1 0x5079a6c in read_sql_construct /data/chenxiaobin/openGauss-server/src/common/pl/plpgsql/src/gram.y:10336
    #2 0x50497dc in plpgsql_yyparse() /data/chenxiaobin/openGauss-server/src/common/pl/plpgsql/src/gram.y:5144
    #3 0x4ee348c in plpgsql_compile_inline(char*) /data/chenxiaobin/openGauss-server/src/common/pl/plpgsql/src/pl_comp.cpp:1884
    #4 0x4ec1f04 in plpgsql_inline_handler /data/chenxiaobin/openGauss-server/src/common/pl/plpgsql/src/pl_handler.cpp:1413
    #5 0x1b1cae8 in OidFunctionCall1Coll(unsigned int, unsigned int, unsigned long, bool) /data/chenxiaobin/openGauss-server/src/common/backend/utils/fmgr/fmgr.cpp:1873
    #6 0x296e230 in ExecuteDoStmt(DoStmt*, bool) /data/chenxiaobin/openGauss-server/src/gausskernel/optimizer/commands/functioncmds.cpp:3522
    #7 0x30c115c in standard_ProcessUtility(processutility_context*, _DestReceiver*, bool, char*, ProcessUtilityContext, bool) /data/chenxiaobin/openGauss-server/src/gausskernel/process/tcop/utility.cpp:3473
    #8 0xfffd80a949c4 in gsaudit_ProcessUtility_hook /data/chenxiaobin/openGauss-server/contrib/security_plugin/gs_policy_plugin.cpp:819
    #9 0x30efdc0 in pgaudit_ProcessUtility /data/chenxiaobin/openGauss-server/src/gausskernel/process/tcop/auditfuncs.cpp:1419
    #10 0x31f5900 in hypo_utility_hook /data/chenxiaobin/openGauss-server/src/gausskernel/dbmind/kernel/hypopg_index.cpp:167
    #11 0x30ba0dc in ProcessUtility(processutility_context*, _DestReceiver*, bool, char*, ProcessUtilityContext, bool) /data/chenxiaobin/openGauss-server/src/gausskernel/process/tcop/utility.cpp:1596
    #12 0x30ae4e4 in PortalRunUtility /data/chenxiaobin/openGauss-server/src/gausskernel/process/tcop/pquery.cpp:1768
    #13 0x30af0d8 in PortalRunMulti /data/chenxiaobin/openGauss-server/src/gausskernel/process/tcop/pquery.cpp:1947
    #14 0x30aaa24 in PortalRun(PortalData*, long, bool, _DestReceiver*, _DestReceiver*, char*) /data/chenxiaobin/openGauss-server/src/gausskernel/process/tcop/pquery.cpp:1207
    #15 0x306936c in exec_simple_query /data/chenxiaobin/openGauss-server/src/gausskernel/process/tcop/postgres.cpp:3063
    #16 0x308ba6c in PostgresMain(int, char**, char const*, char const*) /data/chenxiaobin/openGauss-server/src/gausskernel/process/tcop/postgres.cpp:9328
    #17 0x2e9ac6c in BackendRun /data/chenxiaobin/openGauss-server/src/gausskernel/process/postmaster/postmaster.cpp:9716
    #18 0x2ec58ec in int GaussDbThreadMain<(knl_thread_role)2>(knl_thread_arg*) /data/chenxiaobin/openGauss-server/src/gausskernel/process/postmaster/postmaster.cpp:14377
    #19 0x2ebba7c in InternalThreadFunc /data/chenxiaobin/openGauss-server/src/gausskernel/process/postmaster/postmaster.cpp:15023
    #20 0x4ea5f28 in ThreadStarterFunc /data/chenxiaobin/openGauss-server/src/common/port/gs_thread.cpp:383
    #21 0xfffd973687a8  (/lib64/libpthread.so.0+0x87a8)
    #22 0xfffd972b5488  (/lib64/libc.so.6+0xd5488)

Address 0xfffcff39518c is located in stack of thread T9 (TPLworker) at offset 1084 in frame
    #0 0x5070424 in read_sql_construct6 /data/chenxiaobin/openGauss-server/src/common/pl/plpgsql/src/gram.y:9213

This frame has 13 object(s):
    [32, 34) 'left_bracket' (line 9234)
    [48, 50) 'right_bracket' (line 9235)
    [64, 66) 'left_parentheses' (line 9236)
    [80, 82) 'right_parentheses' (line 9237)
    [96, 100) 'tok' (line 9214)
    [112, 116) 'tableof_func_dno' (line 9247)
    [128, 132) 'type_flag' (line 9749)
    [144, 168) 'ds' (line 9216)
    [208, 248) 'context' (line 9229)
    [288, 480) 'buf' (line 9227)
    [544, 742) 'tableName1' (line 9703)
    [816, 1014) 'tableName1' (line 9764)
    [1088, 2112) 'typname_indexs' (line 9233) <== Memory access at offset 1084 underflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
Thread T9 (TPLworker) created by T0 here:
    #0 0xfffda8c355b4 in __interceptor_pthread_create ../../.././libsanitizer/asan/asan_interceptors.cpp:214
    #1 0x4ea6ec8 in gs_thread_create_ex(gs_thread_t*, void* (*)(void*), int, void*, cpu_set_t*) /data/chenxiaobin/openGauss-server/src/common/port/gs_thread.cpp:824
    #2 0x2ebbcdc in initialize_thread(ThreadArg*) /data/chenxiaobin/openGauss-server/src/gausskernel/process/postmaster/postmaster.cpp:15039
    #3 0x2ebc6a8 in initialize_worker_thread(knl_thread_role, Port*, void*) /data/chenxiaobin/openGauss-server/src/gausskernel/process/postmaster/postmaster.cpp:15123
    #4 0x31228d0 in ThreadPoolWorker::StartUp() /data/chenxiaobin/openGauss-server/src/gausskernel/process/threadpool/threadpool_worker.cpp:136
    #5 0x31072d0 in ThreadPoolGroup::AddWorker(int) /data/chenxiaobin/openGauss-server/src/gausskernel/process/threadpool/threadpool_group.cpp:161
    #6 0x3107148 in ThreadPoolGroup::InitWorkerSentry() /data/chenxiaobin/openGauss-server/src/gausskernel/process/threadpool/threadpool_group.cpp:153
    #7 0x3106be0 in ThreadPoolGroup::Init(bool) /data/chenxiaobin/openGauss-server/src/gausskernel/process/threadpool/threadpool_group.cpp:126
    #8 0x30fc4dc in ThreadPoolControler::Init(bool) /data/chenxiaobin/openGauss-server/src/gausskernel/process/threadpool/threadpool_controler.cpp:161
    #9 0x2e6a7b4 in ServerLoop /data/chenxiaobin/openGauss-server/src/gausskernel/process/postmaster/postmaster.cpp:3922
    #10 0x2e64d40 in PostmasterMain(int, char**) /data/chenxiaobin/openGauss-server/src/gausskernel/process/postmaster/postmaster.cpp:3203
    #11 0x2db3f84 in main /data/chenxiaobin/openGauss-server/src/gausskernel/process/main/main.cpp:352
    #12 0xfffd97203ebc in __libc_start_main (/lib64/libc.so.6+0x23ebc)

```
【原因分析】:
1. 这个问题的根因
2. 问题推断过程
3. 还有哪些原因可能造成类似现象
4. 该问题是否有临时规避措施
5. 问题解决方案
6. 预计修复问题时间

【日志信息】(请附上日志文件、截图、coredump信息):

【测试代码】:

openGauss/openGauss-server

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