Some statements may be too long and consume too much memory when using the Plan Cache

[Reminiscent]

Enhancement

Some queries may be too long and consume too much memory when using the Plan Cache. For example, in with large lists. For a single query that consumes too much memory, we need to skip caching such queries

[jackysp]

Insert statements with many placeholders will also consume too much memory! TiDB turns plan cache enabled by default in 6.1, many customers met this issue. I think we should limit the condition of the number of placeholders for each SQL in plan cache.