introduce comparison expressions

[krlmlr]

Extended version of #270, with joins.

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 308ce26 is merged into main:

• ✔️001_tpch_01: 24.1ms -> 23.4ms [-6.68%, +0.48%]
• ✔️001_tpch_02: 124ms -> 123ms [-2.12%, +0.4%]
• ✔️001_tpch_03: 65.6ms -> 65.1ms [-3.88%, +2.35%]
• 🚀001_tpch_04: 23.6ms -> 22.8ms [-4.02%, -2.11%]
• ✔️001_tpch_05: 120ms -> 120ms [-2.18%, +1.05%]
• 🚀001_tpch_06: 15.1ms -> 14.6ms [-5.05%, -0.36%]
• 🚀001_tpch_07: 139ms -> 135ms [-4.84%, -1.57%]
• 🚀001_tpch_08: 161ms -> 158ms [-2.57%, -0.77%]
• ✔️001_tpch_09: 134ms -> 133ms [-1.98%, +0.78%]
• 🚀001_tpch_10: 74.5ms -> 72.8ms [-4%, -0.48%]
• ✔️001_tpch_11: 60.9ms -> 60.3ms [-2.15%, +0.23%]
• ❗🐌001_tpch_12: 28.8ms -> 57.2ms [+93.4%, +103.6%]
• ✔️001_tpch_13: 19.6ms -> 19.6ms [-2.05%, +1.77%]
• 🚀001_tpch_14: 21ms -> 20.6ms [-3.29%, -0.89%]
• ✔️001_tpch_15: 63.1ms -> 62.7ms [-2.93%, +1.68%]
• ✔️001_tpch_16: 63.8ms -> 63.4ms [-1.88%, +0.78%]
• ✔️001_tpch_17: 28ms -> 27.7ms [-4.29%, +2.13%]
• ✔️001_tpch_18: 25.1ms -> 24.6ms [-4.61%, +0.53%]
• ✔️001_tpch_19: 134ms -> 133ms [-2.27%, +1.84%]
• 🚀001_tpch_20: 80.9ms -> 78.4ms [-5.12%, -1%]
• ✔️001_tpch_21: 183ms -> 181ms [-4.04%, +2.12%]
• ✔️001_tpch_22: 132ms -> 131ms [-4.03%, +1.86%]
• ✔️010_tpch_01: 84.7ms -> 82.4ms [-9%, +3.45%]
• ✔️010_tpch_02: 72.2ms -> 73.2ms [-1.83%, +4.75%]
• 🚀010_tpch_03: 65.5ms -> 62.1ms [-6.76%, -3.75%]
• 🚀010_tpch_04: 49.6ms -> 44.7ms [-13.32%, -6.17%]
• ✔️010_tpch_05: 94.4ms -> 93ms [-5.75%, +2.68%]
• ✔️010_tpch_06: 34.8ms -> 33.6ms [-7.04%, +0.6%]
• 🚀010_tpch_07: 113ms -> 108ms [-6.27%, -2.78%]
• 🚀010_tpch_08: 135ms -> 128ms [-8.69%, -1.24%]
• ✔️010_tpch_09: 116ms -> 117ms [-0.81%, +1.83%]
• 🚀010_tpch_10: 84.7ms -> 78.4ms [-10.38%, -4.43%]
• 🚀010_tpch_11: 38.6ms -> 37.1ms [-6.84%, -0.7%]
• 🚀010_tpch_12: 62.7ms -> 60.7ms [-4.52%, -1.9%]
• ✔️010_tpch_13: 53.7ms -> 53.6ms [-2.15%, +1.85%]
• 🚀010_tpch_14: 43.8ms -> 41.4ms [-9.35%, -1.84%]
• ✔️010_tpch_15: 58.9ms -> 55.8ms [-12.39%, +1.99%]
• ✔️010_tpch_16: 46.9ms -> 45.4ms [-8.07%, +1.62%]
• 🚀010_tpch_17: 57ms -> 55.3ms [-5.79%, -0.27%]
• ✔️010_tpch_18: 58.4ms -> 56.5ms [-10.03%, +3.59%]
• 🚀010_tpch_19: 126ms -> 118ms [-8.86%, -3.68%]
• 🚀010_tpch_20: 72.9ms -> 69.6ms [-8.4%, -0.7%]
• 🚀010_tpch_21: 409ms -> 373ms [-10.29%, -7.43%]
• ✔️010_tpch_22: 76.8ms -> 77.4ms [-1.82%, +3.39%]
• ✔️100_tpch_01: 1.19s -> 1.19s [-4.38%, +5.53%]
• ✔️100_tpch_02: 128ms -> 134ms [-7.83%, +17.23%]
• ✔️100_tpch_03: 1.07s -> 1.08s [-6.12%, +6.63%]
• ✔️100_tpch_04: 1.06s -> 1.04s [-4%, +0.96%]
• ✔️100_tpch_05: 1.17s -> 1.17s [-3.71%, +2.19%]
• ✔️100_tpch_06: 999ms -> 993ms [-4.42%, +3.41%]
• ✔️100_tpch_07: 1.12s -> 1.12s [-2.23%, +2.02%]
• ✔️100_tpch_08: 1.18s -> 1.15s [-4.46%, +0.49%]
• ✔️100_tpch_09: 1.24s -> 1.25s [-3.19%, +4.35%]
• ✔️100_tpch_10: 1.1s -> 1.1s [-3.26%, +2.18%]
• ✔️100_tpch_11: 94.5ms -> 87ms [-24.6%, +8.76%]
• ✔️100_tpch_12: 1.09s -> 1.07s [-4.3%, +0.89%]
• ✔️100_tpch_13: 331ms -> 345ms [-12.87%, +21.49%]
• ✔️100_tpch_14: 1.01s -> 999ms [-4.76%, +1.99%]
• ✔️100_tpch_15: 1.1s -> 1.1s [-4.91%, +3.82%]
• ✔️100_tpch_16: 123ms -> 131ms [-12.39%, +25.7%]
• ✔️100_tpch_17: 1.08s -> 1.06s [-4.02%, +0.19%]
• ✔️100_tpch_18: 1.1s -> 1.1s [-6.09%, +5.88%]
• ✔️100_tpch_19: 1.16s -> 1.18s [-0.4%, +3.96%]
• ✔️100_tpch_20: 1.06s -> 1.06s [-0.8%, +2.48%]
• ✔️100_tpch_21: 2.25s -> 2.22s [-5.28%, +2.52%]
• ✔️100_tpch_22: 177ms -> 175ms [-7.56%, +5.53%]

Further explanation regarding interpretation and methodology can be found in the documentation.